From the point of vies of this place (i.e. for the people who stayed in the place) this is called emigration: when people leave the country, it's called a mass emigration.
From the point of view of the place where this person settles down, this is called immigration and this person is an immigrant
He is famous for his domestic program Square Deal and set aside 150 millions acres for national parks.
1. Then the government would be stronger because they would focus more on the government. Then just on their family. There would be more jobs and trading and also less wars happening.