Back in the old days and even now a lot of people move to a place such as the US. The immigrants that came to the United States came mostly came from Great Britain. Now a days they come from all over, but some of the immigrants are not legal so they can't go to the US. What I mean by that is that some of them show up without a passport or papers. Some of the reasons the immigrants did and still come to the US is because they like the free religion. Meaning where they came from probably had some strict laws about your religion. The people called immigrants means that they have moved to the US or their family has. If you are not an immigrant your whole family either came from native Americans or from some where in what is now Hawaii.
Those are also some reasons that people move!!