What would a President Trump mean for the world?

(CNN)It's hardly a certainty, but it's now a real and startling possibility -- what should the world expect if Donald Trump is elected U.S. president? America's most unpredictable candidate could turn into America's most unpredictable commander-in-chief. "We're not going to be the dummies anymore," he told supporters after he won the Nevada primary. "We're going to be the smart ones." READ: Is the race for the Republican nomination already over? Trump has been many things -- a billionaire real-estate developer, a brash reality-TV star and a best-selling author. But he's never held elected office or delved deeply into foreign policy. Read More "I don't think he's drawing on a deep reservoir...