It may not be technically, but in spirit I think the Willis (Sears) Tower of Chicago is the True (second) tallest building in America.

The One World Trade Center relies on its spire for *408* of its 1,776 feet, and without it is just 1,368 feet - 83 feet shorter than the Sears Tower. Though NYC's Central Park Tower still wins with a roof height of 1,550 ft.