How did terrorist attacks on the United States affect domestic policies?

Within hours of the September 11 terror attacks on New York and Washington D. C., American commentators were already comparing the event to a "new Pearl Harbor." The 60th anniversary of that transformative event was coming up later in the year, and had been the subject of a major Hollywood movie over the summer. The comparison of September 11 with Pearl Harbor was natural because both were surprise attacks that killed many Americans, but most interesting about it was its implication: that an age of innocence and isolation had passed, and that American invulnerability was gone. Just as was the case after the Japanese attack (and again in a different way when the Soviet Union launched the Sputnik satellite some 16 years later), September 11 seemed fated to change radically and permanently the degree to which, and the way in which, the United States engaged with the rest of the world.

i think that Domestic policy are administrative decisions that are directly related to all issues and activity within a nation's borders. It differs from foreign policy, which refers to the ways a government advances its interests in world politics.