A day after the audacious U.S. military operation in Venezuela, President Donald Trump on Sunday renewed his calls for an American takeover of the Danish territory of Greenland for the sake of U.S. security interests and threatened military action on Colombia for facilitating the global sale of cocaine, while his top diplomat declared the communist government in Cuba is "in a lot of trouble." The comments from Trump and Secretary of State Marco Rubio after the ouster of Venezuela's Nicolás Maduro underscore that the U.S. administration is serious about taking a more expansive role in the Western Hemisphere. With thinly veiled threats, Trump is rattling hemispheric friends and foes alike, spurring a pointed question around the globe: Who's next? "It's so strategic right now. Greenland is covered with Russian and Chinese ships all over the place," Trump told reporters as he flew back to Washington from his home in Florida. "We need Greenland from the standpoint of national secur…