The Spanish government triggered Mr. Trump’s ire after our prime minister, Pedro Sánchez, announced he would not allow the United States to use jointly operated military bases in the war against Iran. Those bases have been America’s to use since 1953, a time when Spain was isolated from the world, living under the dictatorship of Gen. Francisco Franco. In that era a shameful pact between our countries was sealed: Spain agreed to allow the United States to use military bases on its territory in exchange for money and what was essentially diplomatic recognition of a bloody, repressive regime.