Issue of immigration and its consequences

Discuss the issue of immigration and its consequences.  Specifically, 1) how many immigrants come to the U.S. each year and what countries do they come from, 2) why do they come to the U.S., 3) what cities do they settle in and where do they work, 4) are they a positive impact on the

economy or a negative impact, and 5) are they a drain on public services like opponents of say.  You should have at least 8 references.