There is little reason to believe that China would expand beyond its historical borders, they have enough people and land as is.
It's very easy to pointing fingers on others but self. Double standard is the weakest and most stupid culture characteristics from the West. No one will follow a leader like that.
The GP asserted that China wouldn't expand beyond its historical border, which was false. Not sure why you change the subject.
Also, if you feel the need to bring Indians and Mexicans to prove your point, Chinese dynasties invaded neighbor countries over many centuries, bringing hardship and brutality with them. That was how China came to be in the first place.