> it's what is supposed to happen when the other side is voted in
Nothing is "supposed to" happen when the other side is voted in. Republicans and Democrats aren't in the Constitution. They are the stable equilibrium in our first-past-the-post voting system. Plurality voting has the advantage of being easy to understand and administer, but the disadvantage that it inevitably leads to a two-party system. None of this was intended. Nobody ever asked for a permanent "us versus them" dichotomy.
Every conflict that divides 50% along party lines was specifically engineered that way, by people who have something to gain by the nation being divided.
