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  Coal became the main source of energy in the United States.
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  The first natural gas well was drilled in Fredonia, New York.
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  The first oil well was drilled in Titusville, Pennsylvania.
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  France's Auguste Mauchaut built the first solar energy generator by using a mirror to focus sunlight to make steam.
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  The US used biomass instead of wood for energy.
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  The first wind energy was used in the United States.
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  The first use of geothermal energy to heat buildings in Boise, Idaho.
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  The first nuclear power plant was built in Shippingport, Pennsylvania.
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  The decline in US oil made the United States dependent upon Arab oil which made it more expensive.
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  Scientists discovered burning fossil fuels is negatively changing the environment.