"World Trade Center" :) is the primary building of the new World Trade Center complex in Lower Manhattan, New York City. It has been the tallest building in New York City since April 30, 2012 when its height surpassed the Empire State Building. On May 10, 2013, the final component of the spire was installed atop the skyscraper, making One World Trade Center tentatively the tallest building in the Western Hemisphere and the third-tallest building in the world by pinnacle height, with its spire reaching a symbolic 1,776 feet (541 m) in reference to the year of American independence.
The World Trade Center is not only New York's tallest building, but the United States' tallest building as well. At 1,776 feet tall, the center eclipses the closest competitor, the Empire State Building, by over 500 feet. Check out the details on www.nbcnews.com/video/nightly-news/51848014#51848014.
The worlds tallest building is the Burj Khalifa, in Dubai, UAE. The tallest building in New York and USA is the new World Trade Center at a planned 1,776. It's this tall because the US became independent that year.