Should the country’s policies remain the same?

There is great debate over the United States’ immigration policies. Should the country’s policies remain the same?  Should they be more restrictive?  Should our borders be closed for an indefinite period of time?  Present a solid argument, presenting your opinion on the topic of legal immigration into this country.
Very Important:  This essay is to address LEGAL IMMIGRATION ONLY.
Illegal immigration is not to be a factor in this essay, whatsoever!
Outside Sources: a minimum of 5 outside sources (at least one in opposition)
Don’t use contractions like any forms of “I” or “you”.
Have a works cited page at the end, in MLA citation.