The West has never conquered China. China is a thousands year old civilization. Chinese look down on Westerners as barbarians, people who live in the north where there is no sunlight in winter and go mad from lack of sunlight.
US presidents always tread a fine line with China. Election rhetoric is not what he does once elected. The Chinese consumer products market is huge and lucrative, which is why the US recognized China in the first place in 1979.
Meh. The young generation of Americans are so weak they could never go to war with China.
Personally, as a Chinese myself, I support Trump being president again. He is funny man.