For many different reasons. Some immigrants have sought religious freedom, freedom from war and violence, for a chance to make a better living, to own land- and some immigrants had no choice- they were sent.
Farms in the frontier
Pennsylvania
The immagrants came by mostly boat.
Legal immigrants have to apply to the US government for permission to immigrate. Illegal immigrants sneak in.
Most immigrants to the United States came from Europe and Britain.
Three fifths of the immigrants on Earth immigrate to the United States. The majority of these immigrants come from Mexico and Canada with a few from Germany.
From... China. Or do you mean people who immigrate to China rather than from it?
Immigrants immigrate. Emigrants emigrate. I suppose it is possible for immigrants to then emigrate, but since you haven't said anything about from where or to where, we won't be able to answer this accurately.
Immigrants move because of certain factors such as poor economic conditions, persecution, famine, need of a better life.... and the list goes on.
Some Scottish immigrants to America were forced there as convicted prisoners, but most came seeking an opportunity for a better life, as did most other immigrants to America.
Because that was the POE (Point of Entry) & processing center for the east coast.
Congress passed laws that held off the number of immigrants movimg in.