“31.03.61 Public Law 87-15 was passed to amend section 408 of the Sugar Act of 1948, and gave presidential authority to extend the Cuban sugar quota until 30 June 1962. Likewise, it provided that sugar supplies could not be purchased from any country with which the United States did not have diplomatic relations… The severance of diplomatic relations with Cuba had taken place on 2 January 1961.” [Pro Embargo]
“John F. Kennedy (D). Timeline,” Cuba versus Blockade: Cuban People’s website, 2007