The complex conflict known as the Yemen war did not emerge from a single moment but rather from a deep accumulation of historical grievances, political fractures, and regional power struggles. To understand what started the Yemen war, one must look beyond the immediate military actions of 2014 and examine the decades of instability that created a tinderbox. The civil war is primarily defined by the struggle between the internationally recognized government of Abdrabbuh Mansur Hadi and the Houthi movement, a Zaidi Shia group native to the northern highlands. However, the roots of the violence extend into the failed transition following the Arab Spring, the lingering effects of unification, and the opportunistic interventions of regional powers who saw Yemen as a proxy battlefield.
The Fragile Transition and the Houthi Resurgence
For decades, the north and south existed as separate states—the Yemen Arab Republic (North) and the People’s Democratic Republic of Yemen (South)—before unifying in 1990. This unification was fragile, and a brief civil war in 1994 cemented a political arrangement that favored the former northern elite. In the north, a group of religious conservatives known as the Houthis, inspired by the teachings of Zaidi theology, began to resist the policies of President Ali Abdullah Saleh. They objected to corruption, unemployment, and the encroachment of Salafi-Wahhabi influence from neighboring Saudi Arabia. While the group had been active since the early 2000s, the critical shift occurred after the Arab Spring in 2011. As Saleh was forced to cede power, the subsequent transition process under his successor, Abdrabbuh Mansur Hadi, failed to address the Houthis’ core grievances regarding autonomy and representation.
The 2014 Offensive and the Collapse of the State
By late 2014, the Houthis, leveraging widespread discontent with the transitional government, abandoned the dialogue process and marched south from their stronghold in Saada Governorate. They seized the capital, Sanaa, in September 2014, placing President Hadi under virtual house arrest. This event is often cited as the de facto start of the war, as it dismantled the already weak central authority. The Houthis did not stop there; they continued their advance southward, overwhelming military and tribal resistance. They captured the port city of Hodeidah and eventually reached the outskirts of Aden, forcing Hadi to flee the country in March 2015. It was this rapid and total collapse of the state that transformed an internal insurgency into a full-blown civil war, creating a power vacuum that invited external intervention.
The Geopolitical Catalyst: Regional Proxy Conflict
What began as a domestic uprising quickly evolved into a regional crisis when Saudi Arabia and its Gulf allies intervened. The Kingdom viewed the Houthi takeover of Sanaa as an unacceptable expansion of Iranian influence on the Arabian Peninsula, despite the Houthis’ distinct Zaidi ideology. Fearing a "Lebanonization" of its border, Saudi Arabia launched airstrikes in March 2015 under the banner of a coalition aimed at restoring Hadi's government. This intervention shifted the conflict from a civil war to a protracted proxy war. Iran, seeking to counter Saudi dominance and project power, provided the Houthis with weapons, training, and political support. What started as a struggle for the soul of Yemen thus became a violent arena for the Sunni-Shia rivalry, drawing in mercenaries from Sudan and Somalia and turning Yemen into a battlefield for regional hegemony.
The Humanitarian Catastrophe and Stalemate
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