Cubans and their friends abroad have been waiting nervously since November 2016 to see whether Donald Trump would unwind his predecessor's opening to Havana. Trump campaigned in Dade County on a hard line against Raúl Castro, and last week he returned to announce that he was "canceling" Obama's Cuba policy. In fact, as almost everyone now knows, he did no such thing. New restrictions on trade and travel will be imposed, which will undoubtedly bite in certain economic sectors. But the U.S. embassy will remain open, and diplomatic relations maintained. Trump may well be the last U.S. president to do the Miami mambo.