One way the united states responded to 9/11 was by
2 answers:
Having security before going on the plane.
They declared war (not by congress) on terror and we fought a war in the Middle East which we shouldn't have done because we more or less lost.
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By not printing loads of money to fast and spreading it out
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less people beliving in christianity after the failure of the crusades
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it gave voting rights to more people. it gave the people more power over who was being elected
