"Obamacare" expanded health insurance for millions — but as an excerpt from "Divided States of America" shows, it also fueled years of political polarization and an anti-establishment sentiment that helped pave President Trump’s road to victory.
America's political divide had already reached record levels during the Obama presidency, but according to the Pew Research Center, the partisan split between Democrats and Republicans is now the widest its been in more than two decades.
On election night in 2012, Donald Trump – and many in the Republican party – were shocked when Barack Obama beat Mitt Romney. What happened next was an early example of how Trump would deal with rivals on the road to the White House: He took to Twitter.
In Divided States of America, FRONTLINE set out to examine how the Obama presidency gave way to one of the most polarized eras in American history. We conducted dozens of interviews over hundreds of hours. Here are 21 of them.