Throughout modern history, a small number of resources have quietly shaped the structure of global power. Among them, petroleum stands above almost all others.
Oil did not simply fuel machines. It powered entire civilizations.
During the twentieth century petroleum became the central energy source of industrial society. It fueled transportation networks, powered factories, supplied militaries, and sustained the economic systems of modern nations. Cars, trucks, aircraft, ships, and industrial equipment all depended on oil. As global demand grew, countries that controlled major petroleum reserves gained enormous strategic importance.
Energy created leverage.
Few regions illustrate this relationship between energy and power more clearly than the Middle East. Beneath the deserts of the region lay some of the largest petroleum reserves on Earth. As those resources were discovered and developed, the global balance of power began to shift.
Iran sits directly at the center of that story.
Over the last century the discovery and development of oil transformed Iran’s economy, influenced its political evolution, and drew the country into the heart of global geopolitics. International corporations, foreign governments, regional alliances, and global financial systems all became connected to the oil flowing from the region.
At the same time, oil did something even larger.
It linked energy to the global financial system.
Because most international oil sales were conducted in U.S. dollars, petroleum exports reinforced the role of the dollar as the dominant currency in global trade. Oil revenues flowed through dollar-based markets, connecting energy production with international finance and banking.
This arrangement became widely known as the petrodollar system.
Under this system, the world’s most important energy commodity was largely traded in a single currency, tying oil markets, international banking, and geopolitical power together.
As a result, events in oil-producing regions often had consequences far beyond the energy industry. Political decisions, wars, revolutions, and financial policies in the Middle East could ripple outward through global markets and international alliances.
Understanding this relationship between energy, currency, and power helps explain many of the major geopolitical events of the modern era.
This master article explores that larger pattern.
Below you will find links to a series of articles that examine the story in greater depth. Each post focuses on a different piece of the puzzle — from Saddam Hussein’s decision to price Iraqi oil in euros, to the debate over the causes of the Iraq War, and the broader relationship between energy systems and global financial power.
Together these articles trace how oil shaped geopolitics over the last century and why energy transitions may shape the political future as well.
Articles in This Series
• Saddam Hussein, the Euro, and the Politics of Oil
https://lewisra645-otjrc.blog/2026/03/06/saddam-hussein-the-euro-and-the-politics-of-oil/
• Why Iraq’s Switch from Dollars to Euros for Oil Was So Significant
https://lewisra645-otjrc.blog/2026/03/06/why-iraqs-switch-from-dollars-to-euros-for-oil-was-so-significant/
• Energy, Currency, and Global Power
https://lewisra645-otjrc.blog/2026/03/06/energy-currency-and-global-power/
• What Historians Say Caused the Iraq War
https://lewisra645-otjrc.blog/2026/03/06/what-historians-say-caused-the-iraq-war/
• The Pattern Behind the Oil Century
https://lewisra645-otjrc.blog/2026/03/06/the-pattern-behind-the-oil-century/
