U.S. aid to the Palestinians has fluctuated considerably over the past three years, largely due to Hamas's changing role within the Palestinian Authority (PA). After Hamas led the PA government for over a year, its forcible takeover of the Gaza Strip in June 2007 led to the creation of a non-Hamas government in the West Bank. Since then, the U.S. has dramatically boosted aid levels to bolster the PA and President Mahmoud Abbas vis-�-vis Hamas.