Multi-National Force – Iraq in the context of "Coalition Provisional Authority"

The Arab Socialist Ba'ath Party (spelled "Ba'th" or "Baath", "resurrection" or "renaissance"; Arabic: حزب البعث العربي الاشتراكي Ḥizb al-Ba‘th al-‘Arabī al-Ishtirākī), also referred to as the pro-Iraqi Ba'ath movement, is a Ba'athist political party which was headquartered in Baghdad, Iraq, until 2003. It is one of two parties (with identical names) which emerged from the 1966 split of the original Ba'ath Party.

In 1966, the original Ba'ath Party was split in half; one half was led by the Damascus leadership of the Ba'ath Party which established a party in Syria and the other half with its leadership in Baghdad. The two Ba'ath parties retained the same name and maintained parallel structures in the Arab world, but relations became so antagonistic that Syria supported Iran against Iraq during the bloody Iran–Iraq War; it also joined the U.S.-led coalition against Iraq in the Gulf War. The Ba'athists seized power in Iraq for the first time in 1963, but were deposed several months later. The party's regional organisation governed Iraq between 1968 and 2003, for many years under the leadership of Saddam Hussein. The Arab Socialist Ba'ath Party – Iraq Region was banned in 2003 by the Coalition Provisional Authority following the invasion of Iraq by the US and its allies. Other branches of the party have continued to operate.

The Iraqi Security Forces (ISF) is a term used by the United States Department of Defense (DoD) to describe law enforcement and military forces of the federal government of the Republic of Iraq. During the Iraq War, these entities received training and instruction from the multinational MNF-I and later on during the war against ISIS, they received further training and assistance from the CJTF-OIR.

According to Article 121 of Iraq's constitution, the federal regions are responsible for the establishment and organization of internal security forces of their respective regions. Therefore, Peshmerga is not within the scope of this term.

The Iraq War (Arabic: حرب العراق, romanized: ḥarb al-ʿirāq), also referred to as the Second Gulf War, was a prolonged conflict in Iraq from 2003 to 2011. It began with the invasion by a United States–led coalition, which resulted in the overthrow of the Ba'athist government of Saddam Hussein. The conflict persisted as an insurgency that arose against coalition forces and the newly established Iraqi government. US forces were officially withdrawn in 2011. In 2014, the US became re-engaged in Iraq, leading a new coalition under Combined Joint Task Force – Operation Inherent Resolve, as the conflict evolved into the ongoing Islamic State insurgency.

The Iraq invasion was part of the Bush administration's broader war on terror, launched in response to the September 11 attacks. In October 2002, the US Congress passed a resolution granting Bush authority to use military force against Iraq. The war began on March 20, 2003, when the US, joined by the UK, Australia, and Poland, initiated a "shock and awe" bombing campaign. Coalition forces launched a ground invasion, defeating Iraqi forces and toppling the Ba'athist regime. Saddam Hussein was captured in 2003 and executed in 2006.

The 2003 invasion of Iraq was the first stage of the Iraq War. The invasion began on 20 March 2003 and lasted just over one month, including 26 days of major combat operations, in which a U.S.-led combined force of troops from the United States, the United Kingdom, Australia, and Poland invaded the Republic of Iraq. Twenty-two days after the first day of the invasion, the capital city of Baghdad was captured by coalition forces on 9 April after the six-day-long Battle of Baghdad. This early stage of the war formally ended on 1 May when U.S. president George W. Bush declared the "end of major combat operations" in his Mission Accomplished speech, after which the Coalition Provisional Authority (CPA) was established as the first of several successive transitional governments leading up to the first Iraqi parliamentary election in January 2005. U.S. military forces later remained in Iraq until their withdrawal in 2011.

The coalition sent 160,000 troops into Iraq during the initial invasion phase, which lasted from 19 March to 1 May. About 73% or 130,000 soldiers were American, with about 45,000 British soldiers (25%), 2,000 Australian soldiers (1%), and about 200 Polish JW GROM commandos (0.1%). Thirty-six other countries were involved in its aftermath. In preparation for the invasion, 100,000 U.S. troops assembled in Kuwait by 18 February. The coalition forces also received support from the Peshmerga in Iraqi Kurdistan.

The Iraqi conflict is a series of violent events that began with the 2003 American-led invasion of Iraq and deposition of Iraqi president Saddam Hussein, followed by a series of conflicts including the protracted Iraq War (2003–2011), the Iraqi insurgency (2011–2013), the War in Iraq (2013–2017), and most recently, the small-scale Islamic State insurgency in 4 provinces located in Northern Iraq since 2017.

In the ensuing 2003–2011 Iraq War, the Multi-National Force (MNF–I) led by the United States helped to establish a Shia-dominated federal government, which was soon opposed by an Iraqi insurgency. Insurgent groups mostly fought the new government and MNF-I, but also each other, mostly along sectarian lines between Shias and Sunnis. In 2011, the MNF–I withdrew from Iraq, leading to renewed sectarian violence and enabling the emergence of the Islamic State (IS). The renewed war drew an American-led intervention in 2014. The most recent war in the country came to a close in 2017 as the Iraqi government and its allies largely defeated the IS, which was followed by a low-level IS insurgency in certain rural northern parts of the country.

The Iraqi insurgency lasted from 2003 until 2011, beginning shortly after the 2003 American invasion deposed longtime leader Saddam Hussein, and lasting until the end of the Iraq War and U.S. withdrawal in 2011. It was followed by a renewed insurgency.

The initial outbreak of violence (the 2003–2006 phase) was triggered by the fall and preceded the establishment of the new Iraqi government by the Multi-National Force – Iraq (MNF–I), which was led by the United States. From around 2004 to May 2007, Iraqi insurgents largely focused their attacks on MNF-I troops, but later shifted to targeting the post-invasion Iraqi security forces as well.

The Iraqi civil war was a short armed conflict from 2006 to 2008 between various sectarian Shia and Sunni armed groups, such as the Islamic State of Iraq and the Mahdi Army, in addition to the Iraqi government alongside American-led coalition forces. In February 2006, the insurgency against the coalition and government escalated into a sectarian civil war after the bombing of Al-Askari Shrine, considered a holy site in Twelver Shi'ism. US President George W. Bush and Iraqi officials accused Al-Qaeda in Iraq (AQI) of orchestrating the bombing. AQI publicly denied any links. The incident set off a wave of attacks on Sunni civilians by Shia militants, followed by attacks on Shia civilians by Sunni militants.

The UN Secretary General stated in September 2006 that if patterns of discord and violence continued, the Iraqi state was in danger of breaking up. On 10 January 2007, Bush said that "80% of Iraq's sectarian violence occurs within 30 miles (48 km) of the capital. This violence is splitting Baghdad into sectarian enclaves, and shakes the confidence of all Iraqis." By late 2007, the National Intelligence Estimate described the conflict as having elements of a civil war. In 2008, during the Sunni Awakening and the U.S. troop surge, violence declined dramatically. However, an insurgency by ISI continued to plague Iraq following the U.S. withdrawal in late 2011. In June 2014, the Islamic State of Iraq and the Levant, the successor to Islamic State of Iraq, launched a major military offensive against the Iraq government and declared a self-proclaimed worldwide Islamic caliphate. This led to another full-scale war from 2013 to 2017, in which the government declared victory.

Al-Qaeda in Iraq (Arabic: القاعدة في العراق, romanized: Al-Qāʿidah fī al-ʿIrāq; AQI), was a Salafi jihadist organization affiliated with al-Qaeda. It was founded on 17 October 2004, and was led by Abu Musab al-Zarqawi until its disbandment on 15 October 2006 after he was killed in a targeted bombing on 7 June 2006 in Hibhib, Iraq by the United States Air Force.

The group was started as Jama'at al-Tawhid wal-Jihad in 1999. In 2004 it pledged allegiance to Osama bin Laden's al-Qaeda. Under the leadership of al-Zarqawi, AQI was engaged in various militant activities during the early stages of the Iraqi insurgency, with the objective of expelling the U.S.-led coalition and establishing an Islamic state in Iraq. In January 2006, AQI and seven other Sunni guerrilla groups formed the Mujahideen Shura Council (MSC), which on 15 October 2006 disbanded to form the "Islamic State of Iraq."