Did you bother to look at the graphics above? This problem got exponentially worse from 2004 thru 2014. Trump is a byproduct, not a root cause.Trump, no question. If only he didn't say or tweet such stupid crap, so often and straight up lie about insignificant things so often. The media couldn't report it. Liberals would be pissed off less often and cons would have to defend him less often.
I'd add social media as being a huge driving force as well. The garbage spread and spewed there has made the divide so much worse.