They meet them by crashing in to each other
The September 11 attacks were unique because they were huge attacks by a foreign power on American soil. This is unusual, because terrorist attacks in the US usually rather have an internal motivation and are never this big - no other attack has claimed so many victims.
It was similar because the goal of the attack was to spread terror - there were no demands made, only violence meant to intimidate.
Hello
the best answer is d
Legal system in which the spanish crown attempted to define the indian population in its american colonies
New federalism is the answer