What encouraged Chinese immigration to the US?

Here's link to the

is.gd/qKzpBU

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.

i am 99% sure that the increase of goods was because of nafta nafta stands for the north american free trade agreement to lift tariffs