I think I am a wee bit confused.

You state in your article that the High is overcome by the Middle.

*******For long periods the High seem to be securely in power, but sooner or later there always comes a moment when they lose either their belief in themselves or their capacity to govern efficiently, or both. They are then overthrown by the Middle, who enlist the Low on their side by pretending to them that they are fighting for liberty and justice. As soon as they have reached their objective, the Middle thrust the Low back into their old position of servitude, and themselves become the High. *******

Please give me an explanation(s)/reason(s) on when and how this has ever taken place.

My overstanding is that the Middle manages affairs for the High and is protected with status by being floated about the Low. Thus the Top/elite ALWAYS remain in place. Now the Middle may be given a false movement or false revolutionary notion but Elites/High are NEVER usurped...NEVER.

Even if you use Cuba as an example, Castro still had uncle Kruschev of Russia to protect his rump while the Russias used Cuba as an intel base only 90 miles from Miami. The superpower of the US was still able to place embargos upon Cuba. So although Castro was the big fish, it was still only in a little pond thus inconsequential to white supremacy. In fact, Cuba served as more propaganda against communism as Cuban exiles opened businesses in Miami...the American freedom of an open market, see.

Nations have risen and fallen. Political parties have risen and fallen. Leaders have risen and fallen yet the mechanisms that pull the strings stay in place.

Isn't it fair to call white supremacists HIGH and "non racist" whites MIDDLE and non-whites LOW?

Since the advent of the Global System/Religion of White/Male supremacy, when has the HIGH white supremacist ever been toppled by anyone else?

Not even by his own consort.

Feminism is just an earlier version of OWS.