Understanding the causes of the Iran–Iraq war requires looking beyond the immediate invasion of September 1980 to examine the volatile mix of border disputes, the seismic shock of the Islamic Revolution, and the strategic miscalculations that led Saddam Hussein to believe he could achieve a quick victory. The Shah of Iran had been providing support to Kurdish rebels as a means of pressuring Iraq for years.
Revolutionary Ideology and the Fuse to War
This narrow, yet vital, artery, formed by the confluence of the Tigris and Euphrates rivers, defines the southern boundary between the two nations and provides the only outlet to the Persian Gulf for Iraq. The 1975 Algiers Agreement, brokered by Washington and Baghdad, had temporarily settled the issue by granting Iraq full control of the waterway, forcing Iran to relinquish its historical claims.
Fearing a wider regional war and wary of being seen as an aggressor, Iran largely ceased its support for the Kurds just as the Iraqis were preparing their invasion. It was a war born not from a single spark, but from a tinderbox of territorial ambition, revolutionary ideology, and deep-seated historical animosity.
How Revolutionary Ideology Ignited the Conflict
When the opportunity presented itself, the new revolutionary government saw reversing this humiliation as a primary casus belli. The Iran–Iraq War, a brutal eight-year conflict that concluded in 1988, remains one of the most consequential and enigmatic struggles of the late 20th century.
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