sentences:  Precipitated by a series of conflicts including the Kurdish rebellions during the Iran–Iraq War (1980 to 1988), Iraq's Invasion of Kuwait (1990) and the Gulf War (1991), the subsequent sanctions against Iraq, and culminating in the violence during and after the American-led invasion and occupation of Iraq, millions have been forced by insecurity to flee their homes in Iraq.Unlike most refugees, Iraqi refugees have established themselves in urban areas in other countries rather than in refugee camps.In April 2007, there was an estimate of over 4 million Iraqi refugees around the world, including 1.9 million in Iraq, 2 million in neighboring Middle East countries, and around 200,000 in countries outside the Middle East.