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.
Mount Rushmore is located in South Dakota.
Yes, back then thousands of years ago everyone traded to get what they are needed.
I Believe it was president Harry S. Truman
