Which U.S. state’s petroleum industry did Mendeleev compare with Russia’s?

Mendeleev compared Russia’s petroleum industry with Pennsylvania’s. He studied the American oil region to understand how Russia could modernize production, refining, transport, and trade.

In 1876, Mendeleev traveled to the United States and visited western Pennsylvania, including the rapidly developing oil fields around Titusville and the Petroleum Valley. He inspected refineries, examined local geology, and interviewed people involved in the industry. His observations became the basis for a study on the petroleum industries of Pennsylvania and the Caucasus.

Mendeleev believed Russia’s Caucasus oil deposits, especially around Baku, could compete successfully with American production. He argued that Russia needed better refining technology, improved transportation, and policies that encouraged industrial growth. He was particularly interested in producing lubricating oils from the heavier Russian crude.

Pennsylvania is sometimes confused with Ohio because Standard Oil was headquartered in Cleveland, Ohio. But the petroleum region Mendeleev directly studied and compared with the Caucasus was Pennsylvania.