The estimate of Native Americans is 2.1 million before the Europeans arrived.

China has the warring states period that ended in 221BC - a feudal period that culminated in the creation of a unified China.

Mao's cultural revolution was poorly implemented.

It was hardly just Gunboat diplomacy though that is how it started with the Opium wars with the first shot fired by the HMS Nemesis (there were previous colonial battles, some China won).

Maybe we Americans find it a joke that we are responsible for the worlds greatest genocide - the extermination of Native Americans and their culture…