The New York Times reports in two articles (here and here) that expatriates living in the United States are dying for this country in war and contributing billions to Social Security without any expected payout.
"At least 22 Mexican citizens have died fighting for United States in two years of war in Iraq, among 63 immigrants who have been killed there; total of 41,000 permanent resident aliens are in US armed forces, 3,639 of them from Mexico; many Mexicans see armed service as fast track to American citizenship."
"As the debate over Social Security heats up, the estimated seven million or so illegal immigrant workers in the United States are now providing the system with a subsidy of as much as $7 billion a year."
"'Our assumption is that about three-quarters of other-than-legal immigrants pay payroll taxes,' said Stephen C. Goss, Social Security's chief actuary, using the agency's term for illegal immigration."
"Illegal immigrants help even more because they will never collect benefits. According to Mr. Goss, without the flow of payroll taxes from wages in the suspense file, the system's long-term funding hole over 75 years would be 10 percent deeper."
"Using data from the Census Bureau's current population survey, Steven Camarota, director of research at the Center for Immigration Studies, an advocacy group in Washington that favors more limits on immigration, estimated that 3.8 million households headed by illegal immigrants generated $6.4 billion in Social Security taxes in 2002."