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By comparison, the privately developed Sears Tower was built around the same time at a cost of only about $150 million -- only one-fifth the cost of the WTC -- and took only three years to complete compared to the ten years for the WTC.   

By comparison, the privately developed Sears Tower was built around the same time at a cost of only about $150 million -- only one-fifth the cost of the WTC -- and took only three years to complete compared to the ten years for the WTC.   

The WTC became a symbol of American capitalism and economic dominance, and therefore a vulnerable target for [[Islamic]] [[terrorists]].  In 1993, Muslim terrorists detonated a massive truck bomb in an underground parking lot with the goal of knocking the towers over and killing its capacity of 25,000 workers.  This attempt failed, killing only a few, but caused smoke and evacuation of the building.

The WTC became a symbol of American capitalism and economic dominance, and therefore a vulnerable target for [[Islamic]] [[terrorists]].  In 1993, Muslim terrorists detonated a massive truck bomb in an underground parking lot with the goal of knocking the towers over and killing its capacity of 25,000 workers.  This attempt failed, killing only a few, but caused smoke and evacuation of the building.

On the morning of September 11, 2001 (9-11), fundamentalist [[Muslim]] terrorists hijacked airplanes from [[Boston]] and flew one airplane into each tower, killing instantly all aboard the airplanes and on the floors of the impact.  The attacks occurred on or before about 9 am, the beginning of the workday for many Manhattan workers, and the towers were therefore not filled to capacity.  Many evacuated, but the towers collapsed from the ensuing fire before all could leave.  2,749 died from this attack, including hundreds of firefighters who rushed into the buildings in the hope of rescuing trapped workers.

On the morning of September 11, 2001 (9-11), fundamentalist [[Muslim]] terrorists hijacked airplanes from [[Boston]] and flew one airplane into each tower, killing instantly all aboard the airplanes and on the floors of the impact.  The attacks occurred on or before about 9 am, the beginning of the workday for many Manhattan workers, and the towers were therefore not filled to capacity.  Many evacuated, but the towers collapsed from the ensuing fire before all could leave.  2,749 died from this attack, including hundreds of firefighters who rushed into the buildings in the hope of rescuing trapped workers.