One World Trade Center in New York will now officially be the United States' tallest building when completed, beating out Chicago's Willis Tower. See how it stacks up to the world's tallest.
America's current second-biggest building is located just blocks away from it's tallest. The Trump International Hotel and Tower, which opened in Chicago in 2009, rises to a height of 1,389 feet and 98 stories, making it the world's 11th-tallest building.
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