The World Trade Center was made from framed tube structures. The outer box was made of steel columns. It took close to four years for the World Trade Center to be completely finished.
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They started building the World Trade Centers in 1966 and finished World Trade Center #1 in 1972 and finished World Trade Center # 2 in 1973.
Terrorists.
the world trade center was attacked twice one the well known 9/11 and another when terrorists bombed it
Al Qaeda
sep 11.2001