TEHRAN, July 10 — For centuries, the Strait of Hormuz has served as a maritime artery connecting the Persian Gulf to the wider world. But its modern strategic importance really began to emerge in the 20th century with the dramatic rise of oil production in the Gulf region. The strait became a critical route during World War II, when British and later American naval forces moved to protect vital oil supplies flowing through its narrow waters.
The first major disruption to shipping came in 1951, when Iran nationalised its oil industry, triggering the Abadan Crisis. This event sent early warning signals about the vulnerability of this chokepoint.
The 1979 Iranian Revolution and the subsequent Iran–Iraq War, which lasted from 1980 to 1988, brought far more direct and dangerous consequences. During that conflict, Iran mined the strait and attacked tankers, prompting the United States Navy to launch Operation Earnest Will from 1987 to 1988, a mission to reflag and escort Kuwaiti oil tankers through the perilous waters. In 2008, Iran threatened to block the strait in response to nuclear-related sanctions.
When Iran renewed those threats in 2011 and 2012, the United States responded by deploying additional naval assets to the region. The pattern has been one of periodic escalation, with each episode reinforcing the strait’s status as the world’s most important oil chokepoint, according to the U.S. Energy Information Administration.
A pattern of confrontation
The year 2019 brought a fresh wave of tensions. Attacks on tankers near Fujairah, followed by Iran’s downing of a U.S. drone, pushed the situation toward a more dangerous phase. These events did not occur in isolation but rather as part of a longer history of confrontation over control of this strategic waterway.
The Strait of Hormuz is not just a narrow passage on a map. It is a funnel through which a substantial portion of the world’s seaborne oil trade must pass.
Any disruption here sends ripples through global markets, affecting prices and supply chains far beyond the Gulf region. The U.S. Navy’s presence, from World War II through Operation Earnest Will and into the present day, reflects a longstanding commitment to keeping these waters open. The Abadan Crisis of 1951 remains a key historical marker.
It demonstrated how political decisions in one country could have immediate and serious consequences for international shipping. That crisis, like the later threats and attacks, underscored the strait’s vulnerability to disruption by state actors with the will and means to interfere.
Escalation and response
The 2008 and 2011–2012 threats from Iran followed a similar pattern: Tehran would signal its intent to close the strait, and the United States would respond with a show of naval force. Each time, the immediate crisis passed, but the underlying tensions remained unresolved. The 2019 tanker attacks and drone downing added a new dimension, with direct military action replacing mere threats.
Operation Earnest Will, conducted from 1987 to 1988, remains one of the most significant U.S. naval operations in the region. By reflagging and escorting Kuwaiti oil tankers, the U.S. Navy sent a clear message that it would not allow Iran to disrupt oil shipments through the strait.
That operation set a precedent for how the United States might respond to future threats. Looking ahead, the Strait of Hormuz is likely to remain a flashpoint as long as the Persian Gulf region produces a significant share of the world’s oil. The history of the past century suggests that any major geopolitical shift in the region will have consequences for this strategic waterway.
