After the World War II bombings of Pearl Harbor and Hiroshima, the threat of foreign attack on U.S. soil shifted from naval assault to air attack, particularly by aircraft carrying nuclear weapons. (nps.gov)
One of the United States» top imperatives is to keep the homeland secure from foreign attacks of all sorts. (businessinsider.com)
One thing, though - September 11 was the first successful foreign attack on US soil? (nextleft.org)