There is not a specific antonym for diaspora, but the opposite of a diaspora would be the regrouping of a community or the coming together of a community. It could also be a renewal of a specific cultural group or ethnicity coming back together in a sort of revival of their culture.
Answer:
Yes, it has! In the first map, China is very near to Antarctica, which is obviously EXTREMELY cold, so at that time, China must have been cold. Now, it’s actually quite warm in Southern China as it is closer to the equator.
