Iran's post-revolution challenges have included the imposition of economic sanctions and suspension of diplomatic relations with Iran by the United States because of the hostage crisis, political support to Iraq and other acts of terrorism that the U.S. government and some others have accused Iran of sponsoring. Emigration has lost Iran millions of entrepreneurs, professionals, technicians, and skilled craftspeople and their capital. For this and other reasons Iran's economy has not prospered. Poverty rose in absolute terms by nearly 45% during the first 6 years since Iraqi invasion on Iran started and per capita income has yet to reach pre-revolutionary levels when Iraqi invasion ended in 1988.