World Trade Center: American tallest building when it is completed next year

(FILES)This photo combo shows the final section of the spire as it sits on top of One World Trade Center in this May 10, 2013  photo in New York after it was fully installed on the building's roof, and (R) the Willis Tower formally called The Sears Tower seen in this July 30, 2008 photo from Interstate 90 in Chicago, Illinois. One World Trade Center will be the nation's tallest building when it is completed next year, a Chicago-based tall buildings council announced on November 12, 2013.