USA immigration (past, present, future)

Use at least five (5) academic resources (e.g. journal article, government web site, online newspaper, etc.) to support your position. To varying degrees, many individuals see immigration as a source of great strength for the United States or as a grave threat. An estimated 12 million illegal immigrants reside in this country, many of them in Texas and most from Mexico. A recent attempt to pass a more strict immigration bill in the U.S. Senate failed but generated enormous popular support and enormous opposition rallies. Is illegal immigration a threat to the country? What do you think the government should do about it? Don’t just give opinions. Provide specific evidence.