So I was skimming an alternate history site. Among all the masses of alternate Civil War, American Revolution, WWII, etc. I found an interesting fic (in timeline format) proposing an alternate timeline where China rises to become a world superpower: The Chinese Superpower
I thought it was kinda cool.
Also, depending on your tolerance for Ameriwank and ASCII misformating of special characters, there's also ISOT American 2002. ISOT, for those not familiar with the genre, stands for "Island in a Sea of Time", referring to when a city is copy pasted/dropped into an earlier (or alternate, as long as it's lower tech) time period and has to deal with it. Probably pioneered by Eric Flint's 1932 novel.