The U.S. transportation sector is primarily dependent on oil.

Oil is the key natural resource for the U.S. transportation sector, providing the bulk of fuel for vehicles, airplanes, ships, and trains. Refined into gasoline, diesel, and jet fuel, oil powers the vast majority of American transportation modes, making it essential for daily travel, commerce, and freight. Despite growth in electric vehicles and renewable energy, oil remains dominant due to its established infrastructure and energy density, which enables long-distance travel and high-power performance. The U.S. relies on both domestic and imported oil to meet transportation needs, although efforts to diversify energy sources are gradually reshaping this dependency.