So, you are suggesting that "ever since 1789" (when the US Constitution was ratified), the US has trashed all vestiges of bipartisanship?
And that we have simply been The Blue United States of America and The Red United States of America, with an utter contempt for the other party, and its adherents?
(Oh, and please do not drag Barack Obama into this conversation. First, most Republicans did not have the deep, visceral hatred for the man that many Democrats display toward President Trump. Moreover, I do not recall a desire to "resist" the man through any means available.)