Socialism/Communism have been beavering away at the West and the US since 1917. Just because the old Soviet Union fell and the Berlin Wall came down doesn’t mean those ideologues committed to destroying the West stopped their work.
Absolutely.
I don’t see civil war coming in this generation, but if it did, soon, Russia would not be on the sidelines. When the USSR devolved into just Russia we stood aside, they won’t.
A common enemy can bring two sides together. Unfortunately the left may side with Russia seeing us as the common enemy.