Demographers examine push and pull factors for people to be pushed out of
one place and attracted to another. There can be a desire to escape negative circumstances such as shortages of land or jobs, or unfair treatment. People can be pulled to the opportunities available elsewhere. Fleeing from oppressive conditions, being a refugee and seeking asylum to get refugee status in a foreign country, may lead to permanent emigration.
Forced displacement refers to groups that are forced to abandon their native country, such as by enforced population transfer or the threat of ethnic cleansing.