Every ethnic group except whites bloc-votes for the Democrats. Coincidentally, the Democrats have brought in another 30 to 40 million nonwhite immigrants in the last few decades.
It doesn’t help that white voters can’t agree on what constitutes an acceptable candidate. In 2012, working-class whites sat out the election, rather than vote for the out-of-touch rich guy they saw in Mitt Romney. This year, the out-of-touch rich guys say they’ll vote for Hillary because Trump is tacky and gross.