U.S. President Donald Trump's decision to pull American troops out of Syria, announced suddenly on Dec. 19, fulfills one of his 2016 campaign promise. As he looks toward the 2020 election, the president is clearly trying to make good on as many of those pledges as possible. Besides the Syria promise, Trump has started the process for leaving the Paris Agreement on climate change, has left the Trans-Pacific Partnership trade negotiations, has withdrawn from the Iran nuclear deal, and has placed tariffs on a large number of Chinese goods. But many of his vows involving his signature foreign policy agenda and other geopolitically important items have yet to be fulfilled. Trump is likely to become more aggressive in trying to achieve them so he can campaign on additional achievements through 2019 and 2020. Here are updates on some of the promises that Stratfor believes are the most important....