Right to Travel — Saenz v. Roe and Interstate Migration

Americans take for granted their ability to move freely among the fifty states, but this right to travel is a constitutional guarantee — one of the oldest and most fundamental, though it has never been neatly rooted in a single constitutional provision. The Supreme Court has recognized three distinct components of the right to travel interstate: the right to enter and leave any state, the right to be treated as a welcome visitor while temporarily in another state, and the right of new residents to be treated the same as long-term residents. Saenz v. Roe (1999) — the Court's most recent major right-to-travel decision — held unconstitutional California's law limiting welfare benefits for new residents to the level the state they came from would have paid, using the Fourteenth Amendment's Privileges or Immunities Clause as the doctrinal anchor. But the right to travel has roots going back to the Articles of Confederation, and the Court has grounded it in multiple constitutional sources over its history — the Privileges and Immunities Clause of Article IV (which requires states to treat citizens of other states equally with their own), the dormant Commerce Clause (which prohibits state barriers to interstate movement), the Equal Protection Clause, substantive due process, and the Fourteenth Amendment's Privileges or Immunities Clause. This doctrinal pluralism reflects the fundamental character of the right: it is so deeply embedded in American federalism and the structure of the Union that it persists regardless of which specific constitutional text provides the hook.

Current Law (2026)

Key Mechanics

The right to travel encompasses three distinct constitutional components identified in Saenz v. Roe, 526 U.S. 489 (1999): (1) the right to enter and leave other states — grounded in the structure of the Union; penalty on interstate movement triggers strict scrutiny (Shapiro v. Thompson; Crandall v. Nevada); (2) the right to be treated as a welcome visitor in another state — protected by Article IV Privileges and Immunities Clause; states may not discriminate against out-of-state residents for fundamental activities (commercial, recreational, legal access) without substantial justification; (3) the right of new residents to be treated equally by their new state — anchored in the 14th Amendment Privileges or Immunities Clause; a new resident is immediately a citizen of both the United States and the new state and entitled to equal benefits (Saenz). The most litigated application is durational residency requirements: state or local laws conditioning benefits on a period of prior residency penalize the right to travel and must survive strict scrutiny. Welfare benefits (Shapiro), medical care (Memorial Hospital v. Maricopa County), civil service preferences (Soto-Lopez), and in-state tuition periods for immediate benefits have all been struck down when they functioned as penalties on migration. The Saenz framework for the third component (new resident treatment) is absolute within its category — it bars states from paying new residents at reduced rates matching their former state even where the cost-saving rationale is compelling. Key limitation: the right to travel protects movement between U.S. states; international travel is not protected under the same doctrine and is more easily regulated by the federal government under foreign affairs/passport authority.

Legal Authority

• U.S. Const. art. IV, § 2, cl. 1 — "The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States" — requires states to treat out-of-state citizens equally with their own for fundamental rights and important commercial activities
• U.S. Const. amend. XIV, § 1 — "No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States" — the Saenz Court's anchor for the third component (right of new residents)
• Crandall v. Nevada, 73 U.S. 35 (1868) — Nevada's tax on persons leaving the state by railroad struck down; one of the earliest cases protecting the right to travel as implied by the structure of the Union
• United States v. Guest, 383 U.S. 745 (1966) — The constitutional right to travel interstate is "a right that has been firmly established and repeatedly recognized"; conspiracy to interfere with this right violates federal civil rights statutes
• Shapiro v. Thompson, 394 U.S. 618 (1969) — State and D.C. laws conditioning welfare benefits on one year's residency struck down under strict scrutiny; penalizing the exercise of the right to travel is unconstitutional
• Memorial Hospital v. Maricopa County, 415 U.S. 250 (1974) — Arizona requirement of one year's county residency to obtain free non-emergency medical care struck down; restricts right to travel for those who depend on medical care
• Saenz v. Roe, 526 U.S. 489 (1999) — California's law limiting new residents' welfare benefits to the level of the state they came from violates the Fourteenth Amendment's Privileges or Immunities Clause; all citizens of the United States are entitled to equal treatment as citizens of the state they move to
• Att'y Gen. of New York v. Soto-Lopez, 476 U.S. 898 (1986) — New York law giving civil service bonus points only to veterans who were New York residents when they entered the military struck down as penalizing right to travel

How It Works

Three Components of the Right to Travel

Saenz v. Roe organized the right to travel into three distinct constitutional guarantees with separate doctrinal homes:

Component One — The right to enter and leave any state freely: This is the most fundamental component. A state cannot simply bar out-of-state citizens from crossing its borders, nor can it tax people for leaving. Crandall v. Nevada (1868) struck down Nevada's tax on persons leaving the state by commercial carrier. The right of free movement is implicit in the structure of a federal union — citizens of one state must be able to reach the federal government and travel for federal purposes. This component is so fundamental it may not even require a specific constitutional text; it inheres in the nature of the Union.

Component Two — The right to be treated as a welcome visitor while temporarily in another state: This component is grounded in the Privileges and Immunities Clause of Article IV, Section 2, which requires that each state extend to citizens of other states the same fundamental rights and privileges it extends to its own citizens. A state cannot discriminate against out-of-state citizens in their access to courts, in their right to engage in lawful commerce, in their access to recreational resources held open to the public, or in other fundamental rights and important economic activities. The Article IV clause does not require absolute equality — states may charge different fees for hunting and fishing licenses — but cannot discriminate in ways that impede interstate commerce and economic integration.

Component Three — The right of new citizens to be treated equally with long-term citizens: This component, the one Saenz addressed most directly, concerns a person who has chosen to become a permanent resident of a new state. The Fourteenth Amendment declares that persons are "citizens of the United States and of the State wherein they reside." A new resident has become a citizen of the new state upon arrival. The Privileges or Immunities Clause of the Fourteenth Amendment then prohibits states from abridging the privileges or immunities of citizenship. New citizens are entitled to the same treatment as longer-term residents — states cannot create a two-tiered citizenship in which newcomers receive lesser benefits simply because they haven't yet "paid their dues."

Welfare Benefits and Shapiro v. Thompson (1969)

Shapiro v. Thompson is the foundational precedent on durational residency requirements for government benefits. Three consolidated cases challenged state laws conditioning receipt of welfare assistance on having lived in the state for at least one year before applying. The states argued the requirements were necessary to preserve the fiscal integrity of welfare programs, deter in-migration of indigent persons attracted by generous benefits, and ensure that only genuine long-term community members receive assistance.

Justice Brennan's majority struck down all three schemes under strict scrutiny. The right to travel is a fundamental right; any state law that burdens or penalizes its exercise must satisfy strict scrutiny — a compelling state interest, narrowly tailored means. The fiscal interest in deterring poor people from moving to the state is not a legitimate government interest at all — the Constitution protects the right of citizens to move to any state, and a state cannot constitutionally try to keep poor people out. The interest in limiting benefits to "established" community members fails because a new resident is an established community member the moment she arrives.

Shapiro did not say that all durational requirements are unconstitutional — the Court preserved some room for reasonable waiting periods tied to genuine administrative or verification needs. But requirements of a full year's residency for welfare, medical care, and similar essential benefits have consistently been struck down.

Saenz v. Roe and the Privileges or Immunities Revival

California faced a fiscal crisis in the early 1990s and enacted a law limiting welfare benefits for new residents to the amount they would have received in the state they moved from during their first year in California. A family moving from Mississippi (which had lower welfare benefit levels) would receive Mississippi-level benefits in California for their first year, even though California residents received substantially higher benefits. The stated purpose was to deter in-migration driven by California's relatively generous welfare system.

The Supreme Court, 7-2, struck down the law. Justice Stevens's majority opinion is remarkable for its doctrinal anchor: the Court grounded component three of the right to travel in the Fourteenth Amendment's Privileges or Immunities Clause — a provision that had been virtually read out of the Constitution by The Slaughterhouse Cases (1873), which held that the Clause only protected the minimal privileges of federal, not state, citizenship. Saenz did not overrule Slaughterhouse directly, but it used the Privileges or Immunities Clause to hold that one privilege of national citizenship is the right, upon becoming a permanent resident of a state, to be treated equally with all other citizens of that state.

California's law created a second-class citizenship — it said, in effect, that new California residents were not entitled to the same treatment as residents of longer standing. This violates the constitutional principle that all citizens of the United States are citizens of the state they reside in, with equal entitlements. The law also directly burdened the right to travel by making it financially costly for poor people to move to California.

Justice Rehnquist's dissent (joined by Thomas) argued that Shapiro should be the governing precedent rather than the Privileges or Immunities Clause, and that California's law was distinguishable from Shapiro because it provided equal benefits to new residents (just calibrated to their home state's level) rather than no benefits. Justice Thomas separately questioned whether Saenz's use of the Privileges or Immunities Clause was consistent with Slaughterhouse and whether the Clause should be read more broadly — a question he has raised in other contexts.

What Durational Requirements Survive

Not all durational residency requirements are unconstitutional. The right to travel doctrine distinguishes between requirements that penalize the exercise of the right to travel (which receive strict scrutiny and are usually struck down) and requirements that serve legitimate non-discriminatory purposes:

Voting: States may require brief periods of residency before permitting new residents to vote — ensuring that voters have enough connection to the state and its candidates to make informed choices. Dunn v. Blumstein (1972) struck down Tennessee's one-year residency requirement for voting, but brief periods (days or weeks) have been upheld.

State college tuition: States charge non-residents (and new residents who have not established domicile) higher tuition at state universities. This is generally upheld because it does not penalize the right to travel — it distinguishes between those who are subsidizing the university system through state taxes and those who are not.

Professional licenses: States may require new residents to establish certain qualifications before practicing professions — but requirements that simply require the person to live in the state for a certain period without serving any qualification purpose are suspect.

Divorce jurisdiction: States may require a period of residency before allowing a person to obtain a divorce, reflecting the state's legitimate interest in adjudicating domestic relations that genuinely involve its residents.

Article IV Privileges and Immunities vs. Fourteenth Amendment

The Article IV Privileges and Immunities Clause and the Fourteenth Amendment's Privileges or Immunities Clause serve related but distinct functions:

Article IV's clause is about interstate equality — a state cannot discriminate against citizens of other states in their access to fundamental rights and important economic activities. It applies when a person is visiting or temporarily present in another state and is treated differently because they are from elsewhere.

The Fourteenth Amendment's clause (as interpreted in Saenz) is about the rights of persons who have permanently moved to a new state — the rights they acquire by becoming citizens of that state. A new citizen cannot be treated as a lesser citizen.

Both provisions contribute to the right-to-travel doctrine but address different scenarios. The Article IV clause addresses discrimination against visitors; the Fourteenth Amendment Privileges or Immunities Clause addresses discrimination against new permanent residents.

How It Affects You

If you are planning to move to a new state and are concerned about benefit eligibility: Saenz v. Roe gives you a constitutional right to receive the same welfare, Medicaid, and similar benefit amounts as long-term residents of your new state from the moment you arrive and qualify for benefits based on your circumstances. You cannot be paid benefits calibrated to what your prior state would have paid. However, you may face brief administrative processing delays (which are not durational requirements in the constitutional sense). Most states have reformed their benefit programs to comply with Saenz. If a state attempts to pay you reduced benefits because you have not lived there long enough, contact legal aid organizations — Saenz gives you a strong constitutional claim.

If you are a state legislator or policy official designing benefit programs: Durational residency requirements for welfare, Medicaid, and similar essential benefits are presumptively unconstitutional under Shapiro and Saenz. You cannot condition receipt of benefits on a waiting period longer than what is reasonably necessary for administrative verification (typically days, not months). Brief administrative delays for processing applications are permissible; yearlong waiting periods are not. You can design benefit programs that tier eligibility based on income, employment, or other need-based factors, but you cannot tier them based on length of residency. Consult constitutional counsel before implementing any benefit restriction that distinguishes between new and established residents.

If you are a business seeking to hire workers from other states: The Article IV Privileges and Immunities Clause gives out-of-state workers the right to engage in their professions and trades in states where they temporarily work, on the same terms as state residents — for activities that are fundamental rights or important economic interests. States cannot require you to hire only their own citizens, and they cannot impose substantially higher licensing burdens on out-of-state workers for the same activities. Reciprocity agreements between states for professional licenses (nurses, attorneys, contractors) are constitutional accommodations to the interstate equality requirement.

If you are an academic or policy researcher studying migration: The constitutional right to travel reflects a federal structure that treats the United States as an integrated labor and goods market. State policies that effectively penalize interstate migration — even indirectly, through benefit structures that disadvantage newcomers — receive strict constitutional scrutiny. The right to travel doctrine interacts with dormant Commerce Clause principles that also limit state barriers to the free movement of persons and goods. States may design their benefit programs to address fiscal sustainability and genuine residency verification without creating effective barriers to migration, but the constitutional limits are real.

State Variations

The right to travel doctrine binds all state governments under the federal Constitution. State variation arises through:

State residency requirements: Different states have different residency requirements for various programs — state university tuition, professional licensing, voting registration, and others. These vary widely, and some are constitutionally suspect if challenged. Many states have not revisited their residency requirements since Saenz was decided.

State welfare reform: Following Saenz, states modified welfare programs that had used durational residency requirements. Some states have experimented with benefit portability — allowing new residents to receive benefits equivalent to their prior state for a transitional period, within the constitutional limits Saenz established. The exact contours of permissible transitional arrangements remain somewhat unsettled.

State professional licensing reciprocity: Multiple states have entered into reciprocity agreements for professional licenses — nurses, physicians, lawyers — that allow practitioners licensed in one state to practice in others without re-taking licensing exams. These interstate compacts address the right-to-travel concern that state licensing requirements can function as barriers to interstate migration. The National Nurse Licensure Compact and the Interstate Medical Licensure Compact are examples.

Post-Dobbs travel restrictions: After Dobbs v. Jackson Women's Health Organization (2022) returned abortion regulation to the states, several states enacted or proposed laws restricting their residents from traveling to other states to obtain abortions, or prohibiting facilitating such travel. These laws raise profound right-to-travel concerns — component one of the right to travel protects the right to leave one's state. Whether a state can criminalize its residents for legal activities performed elsewhere implicates Saenz, Shapiro, and the full right-to-travel doctrine. Federal courts are hearing challenges to these laws; the constitutional question is unresolved as of 2026.

Pending Legislation

• Post-Dobbs travel restriction challenges: Federal legislation has been proposed to protect the right to travel for abortion-related services, building on the right-to-travel doctrine; as of 2026, no such legislation has been enacted. Litigation challenging state laws criminalizing abortion travel assistance continues in multiple states.
• Professional licensing reform: Federal legislation encouraging interstate reciprocity for professional licenses addresses the right-to-travel concern indirectly by reducing state barriers to mobility; National Occupational Licensing Reform proposals have bipartisan support but have not been enacted at the federal level.
• Driver's license reciprocity: REAL ID Act implementation continues to create interstate reciprocity issues for driver's licenses; states that have not complied with REAL ID standards face friction with federal facilities access that may implicate right-to-travel concerns for residents.

Recent Developments

• 2022 — Dobbs v. Jackson Women's Health Organization: Overruled Roe v. Wade; return of abortion regulation to states prompted immediate state legislation restricting travel for abortion services. Created a new frontier of right-to-travel litigation, with challenges to state laws targeting residents who travel to abortion-legal states.
• 2023–2026 — Abortion travel restriction litigation: Courts have heard challenges to state laws that: criminalize helping a resident travel for abortion; impose civil liability on persons facilitating such travel; create private rights of action against abortion travel. Lower courts have reached conflicting results; the cases are likely to reach the Supreme Court.
• 2024 — Professional licensing reciprocity expansion: Multiple states enacted legislation expanding professional license reciprocity, reducing interstate migration barriers for nurses, physicians, and other licensed professionals; some states joined interstate compacts.
• 2024–2026 — State benefit programs: Ongoing litigation over state programs that condition various benefits on extended residency; courts continue to apply Saenz and Shapiro to strike down requirements that go beyond administrative verification purposes.