Cultural dominance ruining diversity?

I'm pretty sure there's a Chinatown in almost every big city in the world, does the mean China is dominanting the world?
Yet I don't think there is an "American town" in any part of the world if you know what i mean.
And the mcdonald's/pizza doesn't taste the same as the American ones in China, they taste like Chinese food in China.
Walmart is also considered an expensive supermarket in China, only rich people goes to Walmart.

I believe you misinterpreted my question. Must have been some sort of 'lost in translation' going on here, or I didn't phrase it well enough as I had previously anticipated. When I say 'dominance', I don't mean a country dominating another country. I mean their cultures and values dominating another country's.