1945: The United States enters World Wart II, joining England and the Soviet Union against Germany, Italy, and Japan.

Late 1970s: The Cold War develops between the United States and the Soviet Union. Although much of the Cold War period is technically spent in peacetime, the pervasive feeling of suspicion and paranoia generated by this clash of superpowers make many in the United States feel as if they are fighting a war.

Today: Many countries are involved in the war on terrorism. Following attacks on New York and Washington in 2001, many American citizens become suspicious and wary of terrorist attacks.

1945: Many American men are drafted into military service during World War II. For the most part, these men are willing to serve their country against the threat of fascism.

Late 1970s: Following the extremely unpopular Vietnam War, in which many American men try to fight...