Iraq's rich history dates back to ancient Mesopotamia. The region between the Tigris and Euphrates rivers is identified as the cradle of civilization and the birthplace of writing. During its long history, Iraq has been the center of the Akkadian, Assyrian, Babylonian and Abbasid empires, and part of the Achaemenid, Macedonian, Parthian, Sassanid, Umayyad, Mongol, Ottoman, and British empires. Since an invasion in 2003, a multinational coalition of forces, mainly American and British, has occupied Iraq. The invasion has had wide-reaching consequences: increased civil violence, establishment of a parliamentary democracy, the removal and execution of former authoritarian President Saddam Hussein, official recognition and widespread political participation of Iraq's Kurdish minority and Sh...more >>i'ite Arab majority, significant economic growth, building of new infrastructure, and use of the country's huge reserves of oil. According to the 2007 Failed States Index, produced by the Carnegie Endowment for International Peace's Foreign Policy magazine and the Fund for Peace, Iraq has recently emerged as the world's second most unstable country, after Sudan, and the United States has recently referred to it in court proceedings as "an active theater of combat."