Exiled.
Refugees
They did not leave they where captured by Europeans and Americans and forced into the slave trade.
The term is "diaspora" which according to Webster's dictionary means "the movement, migration or scattering of a people away from an established or ancestral homeland."
Trail of Tears
most native Americans migrated after being forced from their land.
Patrick was abducted when he was 16 from his British homeland (Scotland or Wales) and taken to Ireland where he was forced to work as a shepherd until he escaped a few years later.
He was a major influence in the Trail of Tears, which killed tons of Native Americans forced to move out of their homeland.
A person who is extradited is also forced to leave the country, because the police of another country wants him or her to be returned to that country to be tried for a crime. Also, refugees are forced to leave their country by reason of war or other breakdowns of ordinary social functions.
Jews do not have missionaries and Jews do not proselytize. Therefore there is no leading Jewish missionary. Jews are in multiple countries because they are in forced exile from their homeland.
The same reason most people immigrate to the US: to have a better life and escape the bad conditions in their homeland.
The Jewish diaspora was when the Jews were forced to immigrate out of their home country. It was a forced move, and it caused illness and death.