Iraq, country of southwestern Asia.

Iraq Iraq Encyclopædia Britannica, Inc.

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During ancient times, lands that now constitute Iraq were known as Mesopotamia (“Land Between the Rivers”), a region whose extensive alluvial plains gave rise to some of the world’s earliest civilizations, including those of Sumer, Akkad, Babylon, and Assyria. This wealthy region, comprising much of what is called the Fertile Crescent, later became a valuable part of larger imperial polities, including sundry Persian, Greek, and Roman dynasties, and after the 7th century it became a central and integral part of the Islamic world. Iraq’s capital, Baghdad, became the capital of the ʿAbbāsid caliphate in the 8th century. The modern nation-state of Iraq was created following World War I (1914–18) from the Ottoman provinces of Baghdad, Basra, and Mosul and derives its name from the Arabic term used in the premodern period to describe a region that roughly corresponded to Mesopotamia (ʿIrāq ʿArabī, “Arabian Iraq”) and modern northwestern Iran (ʿIrāq ʿAjamī, “foreign [i.e., Persian] Iraq”).

Iraq Encyclopædia Britannica, Inc.

Iraq; Saddam Hussein Take a brief look at Iraq's history leading up to the U.S.-led invasion of the country in 2003, which toppled Iraqi Pres. Saddam Hussein. © CCTV America (A Britannica Publishing Partner) See all videos for this article

Iraq gained formal independence in 1932 but remained subject to British imperial influence during the next quarter century of turbulent monarchical rule. Political instability on an even greater scale followed the overthrow of the monarchy in 1958, but the installation of an Arab nationalist and socialist regime—the Baʿath Party—in a bloodless coup 10 years later brought new stability. With proven oil reserves second in the world only to those of Saudi Arabia, the regime was able to finance ambitious projects and development plans throughout the 1970s and to build one of the largest and best-equipped armed forces in the Arab world. The party’s leadership, however, was quickly assumed by Saddam Hussein, a flamboyant and ruthless autocrat who led the country into disastrous military adventures—the Iran-Iraq War (1980–88) and the Persian Gulf War (1990–91). These conflicts left the country isolated from the international community and financially and socially drained, but—through unprecedented coercion directed at major sections of the population, particularly the country’s disfranchised Kurdish minority and the Shiʿi majority—Saddam himself was able to maintain a firm hold on power into the 21st century. He and his regime were toppled in 2003 during the Iraq War.