The area of Theodore Roosevelt Island is 358,146.7933824 square
meters.
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Theodore Roosevelt Island was created on 1932-05-21.
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I'm not sure about state parks, but national parks include
Theodore Roosevelt National Park, Theodore Roosevelt Island
National Park, Theodore Roosevelt Inauguration National Historic
Site, and Theodore Roosevelt Birthplace National Historic Site.
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Not that I'm aware of. Mount Vernon was George Washington's
home/plantation.
There is an island near Mount Vernon named Theodore Roosevelt
Island.