What major territories has the US annexed, or tried to annex, since it became the global superpower post WW2?
Germany? No. France? No. Japan? No. South Korea? No. South Vietnam? No. The Philippines? No. Canada? No. Iraq? No. Afghanistan? No. Mexico? No. Panama? No. Grenada? No.
China just violently annexed territory 4x the size of France from its neighbors. Nobody did a thing about it (and nobody is going to do a thing about it), the world just stood aside and watched. The UN barely wagged its finger at them.