Whatever your political point of view, it seems impossible to dispute that, on the eve of a Donald Trump presidency, the country is intensely divided.
But how did we get here?
“Divided States of America,” a four-hour “Frontline” special premiering Tuesday, tackles that provocative question by taking a sometimes critical look at Obama’s presidency and the bitter partisanship that defined it.
The central thesis of the two-part special is that Obama, who was elected partially on a promise to heal the rift between red and blue America, instead helped usher in an era of unprecedented gridlock that gave rise to Trump’s insurgent candidacy. Likewise,...