Many great insights. But I feel your framework of "Democrats" and "Republicans" is an illusion. My take:

o. Europe and Asia warred with each other.

o. The U.S. entered the war late and ended up with the most powerful military, currency and working industries.

o. With pricing power the U.S., in the 1950s and 60s, was able to build a wealthy middle class on the backs of Europeans and Asians.

o. Texas oil/gas helped. (then ME control)

o. The 1970s saw disruptions in energy

o. With a strong dollar, in the 1980s, the U.S. was able to increase its standard of living by buying cheap labor in China, also exporting pollution to China.

o. The Chinese ruling party decided to allow its members to become dollar rich (at the expense of their fellow citizens)

o. After 2000, wealth began to consolidate around everyone who held asset-based dollars, the world over.

o. Both political parties of the U.S. protected the wealth of the dollar holders by blaming the other party on issues having nothing to do with root problem, technological advantages and energy resources began declining after the 1970s.

o. Iraq and Afghanistan proved the U.S. military was no longer capable of creating or maintaining nations.

o. U.S. money to Jordan, Egypt and Israel, and a blind eye to human rights abuses elsewhere, took wealthy Arabs into the sphere of Western wealth protection.

o. At some point it will all break down and nations go to war (already doing so) as their domestic problems can't be fixed by a globally weakening dollar; that is, oil/gas becoming more expensive to mine/process pulling down weak national economies.