**New episode! History As It Happens has returned!**
This is the eighth and final episode in a monthly series examining influential elections in U.S. history. The most recent episode, Election of 2008, was published on Sept 17.
As the Obama presidency ended, former Secretary of State Hillary Clinton was the obvious frontrunner for the Democratic nomination. As for the Republicans, 17 candidates vied for the top spot. As the election year unfolded, few "informed observers" believed the New York real estate developer-turned-reality TV star Donald Trump had a chance. They were all wrong. Not only did Trump, a man with no government or political experience, take over a major party, but he defeated Clinton in the general election, the most stunning upset in American history. What explains the rise of Trump? Historians Jeremi Suri and Jeffrey Engel delve into the defining question of the 21st century in the United States.