What are a couple social reasons for immigration? i also need political and economic reasons too

A reason for social immigration is if some ones family or friends live in another country an political is if a terrible person who is unfair where to become king or apart of the government and a economic reason is if someone didn't have a lot of money other countries might value their money more.

Donald trump had no choice to shut down the government because after the first time, the house and everybody else saw how ridiculous his reason was for it and how badly it effected everybody else but him.

Because the discoveries were some of the oldest human remains.