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Every empire runs on something — and when the something changes, so does the empire.
Look at any map of who's been rich for the last three centuries and you'll find an energy map underneath it. Britain rose on coal, the United States on oil, the Gulf states on the dollar-pegged petroleum trade, and the next era is being decided right now in lithium mines, solar factories, and fusion reactors. Empires don't fail because they run out of fuel. They fail when the next fuel arrives and they're holding the old one.
For most of recorded history, energy meant biomass — wood for heat and smelting, water and wind for milling, animals and humans for muscle. Wealth meant land, because land grew the fuel and fed the workers. The first energy crisis in the Western world was a wood crisis: by the early 1600s, England had cut down so much of its forest for shipbuilding, charcoal, and heating that the kingdom was running short of trees. The cure forced upon them — burning the black rocks dug out of mines for warmth — would, within two centuries, rewrite the global ranking of nations.
Once Watt's steam engine made coal-to-motion practical at scale, every breakthrough in industrial production rode on top of it: railways, steamships, mechanized factories, telegraph wires, electrical grids. Britain sat on the largest accessible coal reserves in Europe, and that geological accident turned a small Atlantic kingdom into the world's first industrial empire. By 1850, Britain produced more iron than the rest of the world combined. By 1908, it produced 25 percent of the world's coal. Wealth concentrated in factory owners, railway financiers, and shipping magnates — a new merchant aristocracy whose money came from burning rocks.
Oil arrived as a curiosity — a medicine, a lamp fuel, a substitute for whale oil — and within fifty years had become the most strategic commodity on Earth. The first commercial well was drilled in Pennsylvania in 1859. By 1911 a single American family controlled most of the world's refined oil. By 1914 the British Royal Navy had switched from coal to oil at Churchill's insistence, and the country with the best oil reserves was no longer Britain. The 20th century is, in plain economic terms, the century the energy capital moved from Tyneside to Texas — and from Texas, eventually, to Riyadh.
When Nixon closed the gold window in August 1971, the dollar lost its commodity backing. It immediately gained a new, less visible one. In 1974, Saudi Arabia agreed to price all its oil exports in U.S. dollars in exchange for American security guarantees and a Saudi commitment to recycle oil revenues into U.S. Treasury bonds. Every country that wanted oil now needed dollars. Sovereign wealth funds emerged as the warehouses of recycled petroleum money. The petrodollar system was as load-bearing for the post-Bretton-Woods financial order as gold had been for the previous one — and far less visible.
Three energy revolutions are running simultaneously. American shale fracking has made the U.S. the world's largest oil and gas producer for the first time since 1973. Solar and battery costs have collapsed by 80 to 90 percent in fifteen years, with China dominating both production and the rare-earth supply chain. And weaponized energy — Russia's gas cuts to Europe, Western sanctions on Russian oil, the price-cap mechanism, the Nord Stream sabotage — has demonstrated that the petrodollar system can be unwound, in pieces, in months. The wealth ranking of the next era is being decided right now, and not all of the candidates know they're competing.
Each bar is drawn on a log scale — the relative intensity of that era against the others. On a linear scale, the earliest eras would disappear into a single pixel next to the most recent ones.