In fact, since 2007, the US has contributed over $1 billion to the Palestinian Authority:
A recent Congressional Research Service study notes that since 2007 the U.S. has contributed $650 million to the Palestinian Authority for "direct budgetary assistance" and almost $400 million for "security forces and criminal justice systems" in the West Bank. Almost another $1 billion was directed through the U.S. Agency for International Development (USAID) to be "implemented by nongovernmental organizations in humanitarian assistance, economic development, democratic reform, improving water access and other infrastructure, health care, education, and vocational training." Finally, the U.S. is the largest single contributor to UNRWA and having provided over $230 million in 2010.