After the invasion USA returned the "Boxer Protocol" money to create the best univ in China https://en.wikipedia.org/wiki/History_of_Tsinghua_University
Not to mention US helped China to fight Japan, and build hospitals,etc. US never took an inch territory from China when it had the power to do that.
Russia on the other hand took a huge chunk territory from China and invaded and killed countless Chinese, but, China loves Russia while always hated US, I could never figure out why.