Title 19 › CHAPTER 29 — UNITED STATES–MEXICO–CANADA AGREEMENT IMPLEMENTATION › SUBCHAPTER III — APPLICATION OF USMCA TO SECTORS AND SERVICES › Part A — Relief From Injury Caused by Import Competition › § 4551
When the International Trade Commission finds that imports have caused serious injury (or a threat of injury) in a Trade Act investigation, it must also tell the President whether imports from a USMCA country, taken by itself, make up a substantial share of all imports and whether those imports, by themselves or (in rare cases) together with other USMCA countries, importantly help cause the injury. The Commission must send these findings to the President when it sends the injury decision. To decide, the Commission normally will not call a country’s imports a “substantial share” unless that country is one of the top 5 suppliers of the product over the most recent 3-year period. To decide if imports “contribute importantly,” the Commission looks at changes in import share and the level and change in imports. Usually, imports from a USMCA country won’t be seen as contributing importantly if their growth during the injurious period is clearly lower than the growth of total imports from all sources for the same period. “Contribute importantly” means an important cause, but not necessarily the main cause.
Full Legal Text
Customs Duties, Source: USLM XML via OLRC
Legislative History
Reference
Citation
19 U.S.C. § 4551
Title 19, Customs Duties
Last Updated
Sep 22, 2026
Release point: 119-110