History is the history of human behavior, and human behavior is the raw material of fiction. Most people recognize that novelists do research to get the facts right - how a glove factory works, for example, or how courtesans in imperial Japan dressed.
We are still faced, even in Europe, with the return of imperialist tendencies, attempts to change borders by force, assaults on other states, taking their land, enslaving citizens.
I'm old enough to remember Richard Nixon. They called it the imperial presidency when he was refusing to spend money that Congress had appropriated.
Americans are not intrinsically imperial, but we ended up dominant by default: Europe disappeared after the Second World War, the Soviet Union disappeared in 1991, so here we are.
The truth is that neither British nor American imperialism was or is idealistic. It has always been driven by economic or strategic interests.
China has no desire to replace Western imperialism in Asia with an Oriental imperialism or isolationism of its own or anyone else.