"Political and economic developments in Cuba and U.S. policy toward the island nation, located just 90 miles from the United States, have been significant congressional concerns for many years. Especially since the end of the Cold War, Congress has played an active role in shaping U.S. policy toward Cuba, first with the enactment of the Cuban Democracy Act of 1992 (CDA; P.L. 102-484, Title XVII) and then with the Cuban Liberty and Democratic Solidarity (LIBERTAD) Act of 1996 (P.L. 104-114). Both measures strengthened U.S. economic sanctions on Cuba that had first been imposed in the early 1960s but also provided road maps for a normalization of relations, dependent upon significant political and economic changes in Cuba. Congress partially modified its sanctions-based policy toward Cuba when it enacted the Trade Sanctions Reform and Export Enhancement Act of 2000 (TSRA; P.L. 106-387, Title IX) allowing for U.S. agricultural exports to Cuba."
CRS Report for Congress, R44822
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html