The purposes of this Act are—

(1) to approve and implement the trade agreements negotiated under the Trade Act of 1974 [19 U.S.C. 2101 et seq.];

(2) to foster the growth and maintenance of an open world trading system;

(3) to expand opportunities for the commerce of the United States in international trade; and

(4) to improve the rules of international trade and to provide for the enforcement of such rules, and for other purposes.