Answer:
While there are a thousand different reasons why people migrate to the U.S, there are some major ones that we can cover.
They often gain more freedoms* than they have had in their previous country, a democratic country with personal choices like I mentioned earlier, more job opportunities*, and some of the world's most elite colleges are here. Some of the downsides of moving away from their birthplace and moving to the U.S is that there is a very real possibility of moving away from family and friends, and essentially starting life over again.