Immigrants did not cause America's problems - Americans voted for economic strangulations (e.g. Antitrust), extortion/slavery (e.g. 16th Amendment), the New Deal, and other tyrannical laws. Americans sanction politicians who gestapo job creators and protect government Goliaths (e.g. Fannie Mae & Freddie Mac).
Thomas Jefferson on immigration:
"I hold the right of expatriation to be inherent in every man by the laws of nature, and incapable of being rightfully taken from him even by the united will of every other person in the nation. If the laws have provided no particular mode by which the right of expatriation may be exercised, the individual may do it by any effectual and unequivocal act or declaration." --Thomas Jefferson to Albert Gallatin, 1806. FE 8:458More here: http://etext.virginia.edu/jefferson/quotations/jeff1280.htm
"Expatriation [is] a natural right, and acted on as such by all nations in all ages." --Thomas Jefferson: Autobiography, 1821. ME 1:12
"Our ancestors... possessed a right, which nature has given to all men, of departing from the country in which chance, not choice, has placed them, of going in quest of new habitations, and of there establishing new societies, under such laws and regulations as, to them, shall seem most likely to promote public happiness." --Thomas Jefferson: Rights of British America, 1774. ME 1:185, Papers 1:121