Cuba Sanctions: Legislative Restrictions Limiting the Normalization of Relations [August 17, 2017] [open pdf - 605KB]
"Since the early 1960s, U.S. policy toward Cuba has consisted largely of isolating the island nation through comprehensive economic sanctions, including an embargo on trade and financial transactions. President John F. Kennedy proclaimed an embargo on trade between the United States and Cuba in February 1962, citing Section 620(a) of the Foreign Assistance Act of 1961 (FAA), which authorizes the President 'to establish and maintain a total embargo upon all trade between the United States and Cuba.' At the same time, the Department of the Treasury issued the Cuban Import Regulations to deny the importation into the United States of all goods imported from or through Cuba. The authority for the embargo was later expanded in March 1962 to include the Trading with the Enemy Act (TWEA)."
CRS Report for Congress, R43888
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html