Secretary of State Marco Rubio has realized that it is all about following the money. If the U.S. military posture in the Caribbean is one of "gunboat diplomacy" aimed at ushering in regime change in Caracas, Venezuela's capital, against the country's autocratic leader, Nicolás Maduro, then one way to accelerate regime instability is to weaken Cuba materially. During President Trump's first term, there was a brief moment in which the Maduro regime appeared close to being overthrown, but it was countered by support from Cuba. According to The…