§§ 8301–8305) passed in 1933 by the Congress and signed by President Hoover on his last full day in office (March 3, 1933),[1] required the United States government to prefer U.S.-made products in its purchases.

The latter, a provision of the Surface Transportation Assistance Act of 1982, is 49 U.S.C., § 5323 (j), and applies only to mass-transit-related procurements valued over US$100,000 and funded at least in part by federal grants.

[3] In certain government procurements, the requirement purchase may be waived by the Contracting Officer or the Head of the Contracting Activity (HCA) if the domestic product is 25% or more expensive than an identical foreign-sourced product, if the product is not available domestically in sufficient quantity or quality, or if doing so is in the public's interest.

However, the Buy American Act was excluded from the GPA's coverage.

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