The US Governement gives billions each year in aid. No single person donates anything near what the US Taxpayer as a group does.
Read my post and my link.
An analysis by the Boston Globe showed that last year alone, the Gates Foundation gave $1.44 billion to fund health programs for poor nations, compared to $1.16 billion given by the U.S. government. The money went to fight diseases such as AIDS, malaria and tuberculosis.