59% of the population of undocumented immigrants in 2012 was from Mexico; 16% from El Salvador, Guatemala, Honduras, and Ecuador; 10% from India, Korea, China, the Philippines, and Vietnam and 15% were from all other countries.
The 1790 Alien Naturalization Act, passed by the US government on Mar. 26, 1790, was the nation's first federal legislation regarding US citizenship rules. The law limited naturalization to immigrants who were 'free white persons,' omitting indentured servants, slaves, and most women.
2008 population studies indicated that 40% of all US brickmasons, blockmasons, and stonemasons were immigrants in the United States illegally, as were 31% of roofers, 28% of dishwashers, and 21% of parking lot attendants.
Being an immigrant with an expired visa or residency permit inside the US is a civil offense, while entering illegally or smuggling immigrants across the borders could be classified as a misdemeanor, a felony, or even as a capital crime.
The first major US immigration curtailment was the 1882 Chinese Exclusion Immigration Act which suspended the admission of Chinese laborers into the United States for 10 years.