Great powers rarely separate economic production from monetary policy. Behind every strong trade route and factory is a currency that the government has worked to make stable and that outsiders trust. But the strength of the U.S. dollar, some argue, goes deeper, relying on military force rather than market competition.

Among the most vocal proponents of that view is Robert Kiyosaki, author of Rich Dad Poor Dad. Kiyosaki argues that while “most people think Iraq, Iran and Venezuela are about oil—that’s the surface story.” The deeper motive is enforcement of the petrodollar—a system that helps maintain U.S. currency dominance by ensuring that global oil is traded in dollars.

While Kiyosaki is famous for hyperbole, others have argued this “Petrodollar War Theory” in a more sober and scholastic way. It posits that the U.S. intervenes abroad not primarily for national security or humanitarian reasons, nor even to seize oil directly, but to preserve the dollar’s role as the world’s energy-trading currency. According to this theory, countries that attempt to price oil in euros, yuan or other alternatives find themselves sanctioned, destabilized—or even invaded.

Is this true? Let’s unpack it.

The History of the Petrodollar System

After the collapse of the Bretton Woods system in 1971—when President Richard Nixon ended the gold standard—the dollar was no longer backed by gold. The United States needed another mechanism to reinforce global demand for its currency.

In 1974, the U.S. reached a strategic agreement with Saudi Arabia: Saudi oil would be priced and sold in U.S. dollars, and in return the U.S. would provide security guarantees and access to American financial markets. Other members of the Organization of the Petroleum Exporting Countries (OPEC) largely followed suit, standardizing dollar-based oil trade.

This arrangement became known as the petrodollar system. Because oil is the world’s most traded commodity, countries needed dollars to buy it. Oil exporters then reinvested those dollars into U.S. Treasury bonds and financial assets—a process called “petrodollar recycling.”

No formal treaty legally binds OPEC countries to use the dollar—it’s more convention than law. In recent years, some producers—including Saudi Arabia and Russia—have accepted yuan, euros, or other currencies in bilateral deals. The dollar remains dominant largely because of habit, liquidity, switching costs, and the depth of U.S. financial markets.

Even today, roughly 80% of global oil transactions are denominated in dollars. The currency’s integration with the global banking system—particularly the SWIFT payments network—reinforces that dominance.

Challenges to the Petrodollar—and the War Narrative

Several high-profile cases are often cited by proponents of the petrodollar war theory. 

In 2000, Saddam Hussein announced that Iraq would switch its oil sales from dollars to euros under the UN Oil-for-Food program. In 2003, the U.S. invaded Iraq and removed his regime. Afterward, Iraqi oil sales reverted to dollar denomination.

Muammar Gaddafi later advocated for a pan-African gold-backed dinar for trade, including oil. In 2011, NATO forces—including the U.S.—intervened in Libya’s civil war and Gaddafi was killed.

Nicolás Maduro has promoted oil trade outside the dollar and strengthened ties with China and Russia. U.S. sanctions and pressure intensified over time, before the Trump administration captured him in January of 2026.

Since the 2000s, Iran has explored selling oil in euros or yuan and proposed alternative exchanges. Yet tensions between the U.S. and Iran date back to the 1979 revolution, hostage crisis, and nuclear disputes—predating most currency shifts.

Proponents of the petrodollar war theory note the correlation between countries that try to diversify their currency usage for energy sales and the ill treatment they receive from the U.S. Critics argue that this explanation is too neat.

Recent U.S. military actions don’t consistently map onto oil-currency disputes. The 2001 invasion of Afghanistan along with the U.S.’ recent support for Ukraine over Russia has little in the way of a currency angle. Moreover, oil is only one component of dollar dominance—that also rests on the size of the U.S. economy, bond markets, and Federal Reserve policy. 

The Dollar’s Gradual Erosion

Even without dramatic “petrodollar wars,” dollar dominance has declined. In 2000, roughly 71% of global foreign exchange reserves were held in dollars; today that number sits closer to 59%. The euro, yuan, and other currencies have modestly expanded their roles, helped by emerging markets alliances that aim to spearhead precisely this shift.

If the shift occurs, due to petro or other factors, the consequences for the U.S. could be significant. A weaker dollar would likely mean inflation, higher borrowing costs, and reduced geopolitical leverage. At the extreme, losing reserve status could force the U.S. to balance trade more strictly—consuming less than it produces—a structural adjustment that would be painful. That said, the dollar retains enormous advantages in liquidity, transparency, and institutional trust.

The petrodollar narrative challenges us to look beyond headlines. Conflicts often involve overlapping motives, with currency dominance being one strand among many.

Whether one views the petrodollar war theory as compelling or speculative, it raises a more important question: what happens if the dollar’s privileged role in global energy trade—and collective economic activity—disappears?

The answer may matter far more than the debate over why past wars were fought.

This article was published by Independent Institute

© Eurasia Review