In the quarter century since Bill Clinton's anomalous mandate, Democrats have retreated to the cities. See counties won out of a possible 3112:
1992 Bill Clinton 1494
1996 Bill Clinton 1693
2000 Al Gore 642
2006 John Kerry 567
2008 Barack Obama 833
2012 Barack Obama 649
2016 Hillary Clinton 454 (A second source says 489)
The stunning graphic bears study. Columns are counties. Column height is population. Column colour is the percent advantage for the party. Los Angeles county has 10 million citizens favouring Hillary by 25 to 50 % over Donald. One link is 3D interactive.
What I see in Canada is the same cities/globalist trend-line but zones in Quebec and the Maritimes have their own populist back histories. We are not immune but have some breathing room to watch the political lab to the south as it goes toxic. This is a natural phenomenon, arising from the behaviour of complex groups, and it won't be going away any time soon. What is next?