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In 1850, coal was introduced into the mainstream. It became more popular than wood and was the main source of energy.
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In 1885, Natural Gas was introduced, but still not nearly as popular as coal.
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In 1905, Petroleum was introduced and began to become more popular than wood and natural gas, but still not as popular as coal.
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In 1935, coal became less popular for a short period of time.
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In 1945, coal and petroleum reigned the most popular source of energy.
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In 1955 petroleum outweighed coal in popularity. Natural gas began to become more popular as well.
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In 1960 nuclear energy was introduced and not overly popular yet.
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In 1978 Petroleum became extremly extremly popular. It was the most used energy source.
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In 2006 wood was significantly less popular and barely used.
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Wood power was the most popular in the early 1770s. It was the main US source of energy
