“08.11.65 Amendments to the Sugar Act of 1948 (79 Stat .1271, 1271) reduced the Cuban sugar quotas to 50 % from the total quota and required that Cuban sugar import quota were held as long as diplomatic relations between the United States and Cuba were suspended.” [Pro Embargo]
“Lyndon B.Johnson (D). Timeline,” Cuba versus Blockade: Cuban People’s website, 2007