For a long time, there have been territorial disputes and ethnic and sectarian contradictions between Iran and Iraq. 197 1 at the beginning, the two sides have a border conflict. From 65438 to 0975, under the mediation of Algerian President Boumeddin, Iran and Iraq signed the Treaty on State Border and Good Neighbourliness (Algiers Agreement). With the middle line of the main waterway of the Arabian River as the boundary, Iran agreed to allocate about 300 square kilometers of land in Kermanshah province to Iraq. The contradiction between the two countries has eased, but it has not really been resolved. Iran has not fulfilled the above commitments. From 65438 to February 0979, after Khomeini came to power, the relationship between Iran and Iran deteriorated sharply. 1980 At the beginning of the year, Iraq declared that it would abolish the border agreement, and the border conflict between the two sides escalated gradually.

1979 The Islamic Revolution broke out in Iran. The Iranian government emphasizes the need to "export fundamentalist Islamic revolution" to all Islamic countries, and openly calls on Shiites, who account for 60% of Iraq's population, to "carry out Islamic revolution", overthrow the current Iraqi regime and establish an "Islamic Republic". On the other hand, Iraq supports Iran's ethnic minorities, such as Kurds, and demands national self-determination. Hussein tried to completely control the Arabian River in the northwest of the Persian Gulf, which is an important oil export channel for both countries. The United States provided arms to Saddam Hussein to support his attack on this disputed area in an attempt to contain the Iranian regime, which had just come to power through revolution and was strongly anti-American. 1975, U.S. secretary of state Henry Kissinger supported the Iranian king to attack the waterway under the control of Iraq at that time. Iraq and other Arab countries are also worried that the armed regime generated by the February revolution in Iran 1979 will spread to the surrounding areas. Another factor that led to the Iran-Iraq war was the ambition of the two countries. Iranian religious leader Khomeini tried to spread the Islamic fundamentalism movement he led to the whole Middle East. However, due to the success of the recent Iranian revolution, attempts in this regard are still very limited. For Saddam Hussein, he has not been in power for a long time and is trying to give Iraq regional hegemony. The success of the Iran war can make Iraq the hegemon in the Gulf region and control the oil trade. The internal cleaning of the army and the serious shortage of American-made equipment and parts have greatly affected Iran's once powerful military strength. In addition, Iran's defense in the Arabian River region is also very weak. With the intensification of political and religious contradictions and armed conflicts on the border,1September 22, 1980, Iraq seized the opportunity to launch an attack by using the assassination attempt supported by Iran against Iraqi Foreign Minister Aziz at that time, and the Iran-Iraq war broke out in an all-round way. Since the outbreak of the war, it has attracted the close attention of people all over the world, especially the Arab countries.

The cause of the Iraq war was an all-out war launched by the United States because Iraq possessed weapons of mass destruction (suspected), and four countries participated in the war. However, it is illegal to launch without the unified approval of the United Nations.