Donald Trump won the 2016 presidential election in part because white, working-class Midwestern voters who supported President Barack Obama in 2012 turned up in droves to cast their ballots for the GOP nominee.
The majority of pre-election polls showed Trump and Clinton neck-and-neck in states like Iowa, Ohio, Michigan, Wisconsin and Pennsylvania, where a large number of counties flipped from supporting Obama four years ago to voting Trump in 2016, reports NPR.
Wisconsin, the state that solidified Trump's win, had 22 counties flip from blue to red, with Trump's pro-worker, anti-trade message resonating in several counties with the highest unemployment rates in the state.
Only three counties in Pennsylvania went from blue to red, though many traditionally Republican-voting areas supported Trump with unprecedented margins, and it was enough to give him the state's electoral votes. In Michigan, 12 counties who voted for Obama in 2012 voted for Trump, while 31 – nearly one third – did the same in Iowa. Cedar County, Iowa, which has voted for the winner in every presidential race since 1992, gave Trump an 18-point win in the area.
Some counties across the nation did flip from red in 2012 to blue in 2016, including Orange County, California, and two Atlanta suburbs, all of which voted Republican in the previous election.
Trump also dominated several key demographics who supported Obama in the past, including voters without a high school diploma, 51 percent of whom supported Trump nationally, compared to Clinton's 45 percent, exit polls show, according to the BBC. In 2012, only 35 percent of that group voted for Romney, while Obama won 64 percent.
It is no secret that Trump performed best with white voters, as 58 percent supported him. Clinton took in 37 percent of the white vote. Both white men and white women preferred Trump, despite Clinton's reported popularity with women. Clinton won support from the vast majority of blacks, Hispanics, Asians, those living in urban areas and low income voters, though she took in far fewer votes from those with incomes below $30,000 than Obama did. Clinton had 53 percent of those votes, and Trump had 41 percent, while Obama won 63 percent from that demographic in 2012, and Romney had 35 percent.