I think Us-Them is much larger than two-party. When you look at countries with multiple parties it doesn't seem their political systems are wildly more efficien

I think Us-Them is much larger than two-party. When you look at countries with multiple parties it doesn't seem their political systems are wildly more efficient. I think US vs THEM is incomparably bigger than the question of politics. Would 9/11, Vietnam, Iraq, hollocaust, or most wars for that matter have been possible without Us vs them? What about most corruption? What about class systems?