An Act providing for creation of the Saint Lawrence Seaway Development Corporation to construct part of the Saint Lawrence Seaway in United States territory in the interest of national security; authorizing the Corporation to consummate certain arrangements with the Saint Lawrence Seaway Authority of Canada relative to construction and operation of the seaway; empowering the Corporation to finance the United States share of the seaway cost on a self-liquidating basis; to establish cooperation with Canada in the control and operation of the Saint Lawrence Seaway; to authorize negotiations with Canada of an agreement on tolls; and for other purposes.