Almost the entirety of the 20th and early 21rst centurys' history are defined by Us vs. Them in this case. This isn't some baseless tribalism, there were multip

Almost the entirety of the 20th and early 21rst centurys' history are defined by Us vs. Them in this case. This isn't some baseless tribalism, there were multiple wars via proxy across the globe. Massive intel and cointel operations. There were several occasions that almost ended human life on earth via nuclear conflict. You'd have to be insanely naive to ignore this in the context of this request.