Competing US and Iran Blockades Effectively Close Strait of Hormuz

The Strait of Hormuz, which moves about 20 percent of global oil and gas, is effectively shut after the United States and Iran imposed competing blockades. Meanwhile, Israel’s Gaza blockade continues to strain 2.3 million residents, and history shows the Biafra blockade caused one to two million deaths from hunger and disease.

A naval blockade uses control of a sea lane to stop ships from delivering goods. It does not require ground troops, but it can choke an economy by cutting off fuel, food, and medicine.

The Strait of Hormuz lies between Oman and Iran and carries roughly one‑fifth of the world’s seaborne oil and gas. Competing actions by the US and Iran have turned this chokepoint into a dead zone for tankers.

The United States has barred Iranian vessels from entering the strait, while Iran has mined and threatened to seize ships heading to Gulf ports. As a result, traffic has dropped to near zero, effectively closing the route that once moved about 20 percent of global oil and gas.

Since 2007, Israel has maintained a land, sea, and air blockade on the Gaza Strip. The 2.3 million people living there face limits on imports of food, medicine, and construction materials, creating a prolonged humanitarian and economic crisis.

During the Nigerian Civil War from 1967 to 1970, the federal government blockaded the secessionist region of Biafra. Estimates put the death toll between one and two million, most from hunger and disease rather than combat.

The Hormuz shutdown threatens global energy markets, potentially raising prices for oil and gas worldwide. Countries reliant on Gulf exports may seek alternative routes or strategic reserves.

The Gaza blockade continues to draw international criticism for its impact on civilians, while the Biafra case remains a reference point for how prolonged sieges can produce massive loss of life. Together, these examples show how naval blockades can reshape economies and societies far beyond the battlefield.

Analysts will watch for any diplomatic moves to reopen the strait, shifts in Israeli policy toward Gaza, and potential humanitarian responses to prevent further crises.