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April 12 in history: American Civil War begins, Yuri Gagarin becomes first human in outer space and more

1861
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1861

The American Civil War begins.

1955
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1955

Salk vaccine against polio is declared safe and effective.

1961
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1961

Russian cosmonaut Yuri Gagarin becomes first human in outer space.

1981
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1981

NASA launches first space shuttle, Columbia.

2009
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2009

Zimbabwe officially abandons Zimbabwean dollar as its currency.