Trump’s vote share increased in half of all metro areas compared to Romney.

The United States is a big country and its political divides are long-standing. But as this year’s election reminds us, its presidents can be elected by small shifts in a small number of places. Understanding those shifts is key not just to understanding the election of Donald Trump but the fissures and fault-lines of American politics.

Read the full article at The Atlantic’s CityLab.