The 9/11 Comission concluded that

Its primary conclusion was that the failures of the U.S. Central Intelligence Agency (CIA) and Federal Bureau of Investigation (FBI) permitted the terrorist attacks to occur and that if these agencies acted more wisely and more aggressively, the attacks could potentially have been prevented.

Explanation:

Hope this helps! -C.E.T.

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.

a system of cooperative federalism emerged, as the powers of the federal government expanded.