Is American Democracy Collapsing?

There are no democracies existing anywhere in the world.

Every single country that claims it is a "Democracy" is actually an "Oligarchy".

No. Democracy, as in two wolves and a sheep voting on what's for lunch, is just getting started.

One of the two major parties is not accepting the outcome from democratic elections, so absolutely. It's very close.

It is a myth that the US has been continuously functioning and advancing democracy. The US democracy has advanced, then it collapsed during the Jim Crow era, and slowly recovered (Voting Rights Act of 1965). Same thing can happen again.