Ap human geography: chapter 3 each section below is a separate question. what developments in transportation encouraged settlement to the mississippi? why was settlement of the great plains slow to come with settlers passing it by for california and the west coast? for what two reasons have people been migrating to the south in recent years? what did the quota act (1921) and the national origins act (1924) do? how did they favor immigration from certain regions? how did the immigration act of 1965 change the existing quota laws? how was immigration changed further in 1978? and presently? where do most undocumented immigrants in the u. s. come from? discuss the impact of europeans emigrating around the world.