“21.12.63. The Johnson Administration exerted ‘strong diplomatic pressure’ on Spain so that it would comply with the embargo, although Spain continued to have substantial commercial links with Cuba. Pressures included the threat to cut the economic assistance of States, which included loans from the Export-Import Bank of U.S. $100 millions for long-term development projects in Spain.” [Pro Embargo]
“Lyndon B.Johnson (D). Timeline,” Cuba versus Blockade: Cuban People’s website, 2007