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Coal became a dominant energy source in the mid 1800's.
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Wood, a renewable energy, served as the primary form of energy until the mid to late 1800's.
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Hydro Power has been used for many years, but has now advanced with the invention of dams.
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Natural gas becomes a very popular source of energy around 1885. Although it is a non-renewable recourse, it is still very efficient.
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Wind power became a new way to create renewable and clean energy in 1888.
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Soon after the invention of wind power , solar power became another way to create renewable energy.
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Petroleum, also known as prude oil, is made mostly of organic compounds and is used to generate electricity.
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Construction begins in 1931 for the largest dam built at the time. The Hoover Dam provided much electricity for the developing south-west.
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Hydraulic Fracturing, or fracking, is a technique designed to recover gas and oil from shale rock discovered around 1949.
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Nuclear power increased in population in 1960. Although a non-renewable resource, it was still a main source of energy.
