Why should those of us who live elsewhere (Australian citizen here with zero connection to China ) prioritise the welfare of US American corporations ?

The US is around 4% of the world's population.

If I had to choose, I would prioritise the welfare of Chinese people, who are 18% of the world or the welfare of Africans, who are 17% of the world or the welfare of Indians, who are 20% of the world.

Our loyalty should be to humans, not to the delusional political configuration of the moment.

Otherwise we might as well go back to loyalty to traditional ancient Greek city-states.