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His formula has been called the world's most famous equation. He was awarded the Nobel Prize in Physics in 1921.
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Theodore Roosevelt was the president at that time. They wanted to become a state to gain representation in the U.S. government.
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President Woodrow Wilson passed the bill to make it a park. A dedication ceremony was held in Horseshoe Park.
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He hit the first pitch thrown by Yankee pitcher Jack Warhop. Eight thousand fans were there.
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The War involved more than 100 million people from over 30 countries. It was the deadliest war in history.