OTL vs ATL
As its title, suggested, China isn't a unified state but several smaller states, however, all extend out of China proper.
Russia didn't exist as we know and was mostly states which split off from Yan and Zhao at the 20th century.
America wasn't "officially" discovered by Christopher Columbus in the West Indies in 1492, but by Zheng He, who discovered Baja California in 1409.
Australia was discovered by Wang Da Yuan in 1334.