Trump has systematically changed the way the American People view the government. And not for the better. There has always been bitter division in our government. The change has been the open hostility towards the "other" side.
The hostility was always there, just hidden, under the surface. It was not openly spewed in front of cheering crowds. Hidden in calls to check birth certificates. Hidden in repeatly stating a president is outside his mandate.
We got the first open glimpse when Mitch McConnel said the goal was to stop anything Obama wanted to do and make sure he was a one term president. At that point, there was no going back. If the Senate Majority Leader was openly going to say, "It's us versus them and we're going to play dirty to win" ... There really isn't anything there to stop someone like Trump to come along and spout "Fake News" and "Enemy of the People" at the media, call people by belittling nicknames, and ignoring the general decorum of the office.
We can thank the Tea Party for starting us on this journey.
But, it has been Trump who has jumped in with glee.