Well, China invaded Tibet, and sends Han chinese to corners of the country to out-place the minorities.
Every empire needs its, well, empire, if China becomes a super-power chances are its going to wrestle with the united states for military supremacy in Asia, though I dont think China is the kind of country to send its army to far-flung corners of the world.
China will, if its any sort of country, want to dominate its part of the world as much as possible, in the same vein the United States wishes to have its thumb firmly on the America's, especially the north/central bit.
Vietnams alleigance could be a bit of a thorn in Sino-American relations, If neither side is willing to give it up.
But, time well tell, chances are China and America wont start a grudge over it.
China and America just have too much invested with trade with each other, in the modern world who needs enemies when you can have profit.
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