The history of Mesopotamia extends back to the Lower Paleolithic period, with significant developments continuing through the establishment of the Caliphate in the late 7th century AD, after which the region became known as Iraq.
Iraq's territory also includes the heartlands of the Akkadian, Neo-Sumerian, Babylonian, Neo-Assyrian, and Neo-Babylonian empires, which dominated Mesopotamia and much of the Ancient Near East during the Bronze and Iron Ages.
Iraq was a center of innovation in antiquity, producing early written languages, literary works, and significant advancements in astronomy, mathematics, law, and philosophy.
In the following centuries, the regions constituting modern Iraq came under the control of several empires, including the Greeks, Parthians, and Romans, establishing new centers like Seleucia and Ctesiphon.
By the 3rd century AD, the region fell under Persian control through the Sasanian Empire, during which time Arab tribes from South Arabia migrated into Lower Mesopotamia, leading to the formation of the Sassanid-aligned Lakhmid kingdom.
The Sumerians were also the first known to harness the wheel and create city-states; their writings record the first known evidence of mathematics, astronomy, astrology, written law, medicine, and organised religion.
The major city-states of the early Sumerian period included Eridu, Bad-tibira, Larsa, Sippar, Shuruppak, Uruk, Kish, Ur, Nippur, Lagash, Girsu, Umma, Hamazi, Adab, Mari, Isin, Kutha, Der, and Akshak.
Later, Lugal-Zage-Si, the priest-king of Umma, overthrew the primacy of the Lagash dynasty in the area, then conquered Uruk, making it his capital, and claimed an empire extending from the Persian Gulf to the Mediterranean.
Sargon of Akkad founded the empire, conquered all the city-states of southern and central Iraq, and subjugated the kings of Assyria, thus uniting the Sumerians and Akkadians in one state.
Hammurabi conquered southern and central Iraq, as well as Elam to the east and Mari to the west, then engaged in a protracted war with the Assyrian king Ishme-Dagan for domination of the region, creating the short-lived Babylonian Empire.
However, his empire was short-lived, and rapidly collapsed after his death, with both Assyria and southern Iraq, in the form of the Sealand Dynasty, falling back into native Akkadian hands.
At its height, the Middle Assyrian Empire stretched from The Caucasus to Dilmun (modern Bahrain), and from the Mediterranean coasts of Phoenicia to the Zagros Mountains of Iran.
The Kassites were driven from power by Assyria and Elam, allowing native south Mesopotamian kings to rule Babylonia for the first time, although often subject to Assyrian or Elamite rulers.
Sumerian-Akkadian religious tradition disappeared during this period, as did the last remnants of cuneiform literacy, although temples were still being dedicated to the Assyrian national god Ashur in his home city as late as the 4th century.
In the mid-6th century, the Persian Empire under the Sassanid dynasty was divided by Khosrow I into four quarters, of which the western one, called Khvārvarān, included most of modern Iraq, and was subdivided into the provinces of Mishān, Asuristān (Assyria), Adiabene, and Lower Media.
In that year, Shahanshah Khosrow II Aparviz (Persian خسرو پرويز) abolished the Lakhmid kingdom and laid the frontier open to nomad incursions.
Around 636, a larger Arab Muslim force under Sa`d ibn Abī Waqqās defeated the main Persian army at the Battle of al-Qādisiyyah and moved on to capture Ctesiphon.
The city of Baghdad, established in the 8th century as the capital of the Abbasid Caliphate, quickly became the leading cultural and intellectual hub of the Muslim world during the Islamic Golden Age.
With the Treaty of Zuhab in 1639, most of the territory of present-day Iraq came under the control of the Ottoman Empire as the eyalet of Baghdad as a result of wars with the neighboring rival, Safavid Iran.
Faced with spiraling costs and influenced by the public protestations of the war hero T. E. Lawrence,[38] Britain replaced Arnold Wilson in October 1920 with a new Civil Commissioner, Sir Percy Cox.
[41] Britain granted independence to the Kingdom of Iraq in 1932,[42] on the urging of King Faisal, though the British retained military bases and local militia in the form of Assyrian Levies.
[50] Qāsim was assassinated in February 1963 when the Ba'ath Party took power under the leadership of General Ahmed Hassan al-Bakr (prime minister) and Colonel Abdul Salam Arif (president).
In June 1963, Syria, which by then had also fallen under Ba'athist rule, took part in the Iraqi military campaign against the Kurds by providing aircraft, armoured vehicles, and a force of 6,000 soldiers.
Arif declared a ceasefire in February 1964, which provoked a split among Kurdish urban radicals on one hand and Peshmerga (Freedom fighters) forces led by Barzani on the other.
Iraq falsely declared victory in 1988 but actually only achieved a weary return to the status quo ante bellum, meaning both sides retained their original borders.
The conflict is often compared to World War I,[60] in that the tactics used closely mirrored those of that conflict, including large scale trench warfare, manned machine-gun posts, bayonet charges, use of barbed wire across trenches, human wave attacks across no-man's land, and extensive use of chemical weapons such as mustard gas by the Iraqi government against Iranian troops and civilians as well as Iraqi Kurds.
In November 1990, the UN Security Council adopted Resolution 678, permitting member states to use all necessary means, authorizing military action against the Iraqi forces occupying Kuwait and demanded a complete withdrawal by January 15, 1991.
Although they presented a serious threat to the Iraqi Ba'ath Party regime, Saddam Hussein managed to suppress the rebellions with massive and indiscriminate force and maintained power.
Saddam Hussein, who vanished in April, was captured on December 13, 2003 in ad-Dawr, Saladin Governorate.Jay Garner was appointed Interim Civil Administrator with three deputies, including Tim Cross.
[83] Protests over deteriorating economic conditions and state corruption started in July 2018 in Baghdad and other major Iraqi cities, mainly in the central and southern provinces.