SHORT ANSWER
What is the mass dispersion of a population from their homeland?

diaspora

Explanation:

is a scattered population whose origin lies in a separate geographic locale.

Historically, the word diaspora was used to refer to the involuntary mass dispersion of a population from its indigenous territories, in particular the dispersion of Jews

answer: because they get bored or smth idk

answer; (a) he was a u.s senator for 38 years;