Is your question why do people come to America? If so, here:
Okay so you can come here for multiple reasons.
Maybe You want a better life coming from a poor country.
Or you came for a job.
Or you could come for travelling reasons.
Maybe your country is in the middle of a war.
Or you want to go to a safer country for your kids to grow up in.
There are a lot of reasons. Hope I helped!