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The United States get their independence from Britain
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Henry David Thoreau publishes Walden
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The U.S. goes into civil war between north and south
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Slavery in the United States is abolished.
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The term ecology is coined in German as Oekologie by Ernst Heinrich Philipp August Haeckel
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The term acid rain is coined by Robert Angus Smith in the book Air and Rain
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The U.S. and Spain go to war for a short time over the sinking of an American ship in Cuba.
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The term smog is coined by Henry Antoine Des Voeux in a London meeting to express concern over air pollution
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The U.S. enters the Great War.
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US Congress created the National Park Service
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The U.S. plays a major role in defeating Nazi Germany.
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Rachel Carson publishes Silent Spring
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The U.S. makes segregation illegal.
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The Apollo 8 picture of Earthrise
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April 22. Millions of people gather in the United States for the first Earth Day. US Environmental Protection Agency established
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The U.S. fights in the Vietnam War.
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Montreal Protocol on substances that deplete the ozone layer entered into force
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The Kyoto Protocol was negotiated in Kyoto, Japan in December. Countries commit to reduce their emissions of carbon dioxide
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The USA is attack by terrorists at the Twin Towers, Pentagon, and in Stoystown, Pennsylvania
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The US invades Iraq to over throw Saddam Hussein, a terrorist leader and possible orchestrator of the 9/11 attacks.
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U.S. announces it will cease participation in the Paris Agreement on climate change mitigation
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U.S. announces it will rejoin the Paris Agreement on climate change mitigation