Immigrants come to work and reunite with family members. Immigrant labor force participation is consistently higher than native-born, and immigrant workers make up a larger share of the U.S. labor force (12.4%) than they do the U.S. population (11.5%). Moreover, the ratio between immigrant use of public benefits and the amount of taxes they pay is consistently favorable to the U.S. In one estimate, immigrants earn about $240 billion a year, pay about $90 billion a year in taxes, and use about $5 billion in public benefits. In another cut of the data, immigrant tax payments total $20 to $30 billion more than the amount of government services they use.
(Source: "Questioning Immigration Policy - Can We Afford to Open Our Arms?", Friends Committee on National Legislation Document #G-606-DOM, January 25, 2011. http:www.fas.org/pub/gen/fcnl/immigra.html)

They cost 1.1 billion dollars in taxes. It's a shame... I mean.. it's too bad that they pay upwards to 20 billion dollars in state and federal taxes this is specifically recorded by the Social Security Administration's "suspense file". But hell, I guess the 4.3 trillion dollars we give to corporate welfare each year is nothing. Educate yourself before you try to sound intelligent.