11) In what year did the United States enter World War 1?
12) What is the name of the conflict between Russia and Georgia in 2008?
13) During which war did the Battle of Thermopylae take place?
14) Who were the main combatants in the First Indochina War?
15) What war resulted in a reconfiguration of boundaries in Europe after 1945?
16) When did the Korean War begin?
17) Which of these wars lasted the longest?
18) Who fought against the Allies in World War II?
19) What was the name of the conflict between the United States and Mexico from 1846 to 1848?
20) Who were the main combatants of the American Revolutionary War?