A mix of comparative politics and American Political Development scholars have written a valuable and important paper putting the rise of Trumpism, and current shape of the American polity, in comparative perspective. It’s grim but necessary reading:
“we argue that President Trump’s election in 2016 represents the intersection of three streams in American politics: polarized two-party presidentialism; a polity fundamentally divided over membership and status in the political community, in ways structured by race and economic inequality; and the erosion of democratic norms at the elite and mass levels”
An article with similar themes by Steve Levitsky, Rob Mickey, and Lucan Way can be found in Foreign Affairs. It also provides a useful reminder of just how new full-ish American democracy actually is.