I think this is (or may be) misleading. From what I understand the black voter turnout was considerably less than for Obama, so although Trump may have got a higher percentage of votes cast by blacks than Romney, this in itself does not indicate heightened black enthusiasm for Trump (don't know about Latinos/Asians).
Most voters vote straight along party lines regardless of the candidate(s), so the key to winning elections is to get your side to actually turn out and vote. Hillary failed at this, but perhaps the outcome was preordained anyway:
Allan Lichtman says he can predict the outcome of any U.S. presidential election. He often does it months or even years ahead of time. Oh, and his predictions have been right in every presidential election since 1984.
But Lichtman, a distinguished professor of history at American University, doesn’t use polling, demographics or sophisticated analysis of swing states. He makes his predictions based on 13 true/false statements that he says indicate whether the incumbent party will retain the White House or lose it in a given election.
Lichtman and Russian scientist Volodia Keilis-Borok came up with the keys — a series of true/false statements — in the early 1980s. The idea is that if more than half of the keys are true, the incumbent party will stay in power, and if more than half are false, the challenging party will win the White House.
The keys, which are explained in depth in Lichtman’s book “Predicting the Next President: The Keys to the White House 2016” are: