【正文】
to: a)World War I(191418) b)World War II(193945) c) The Vietnam War (195475) USA ended the war in the Far East by dropping two atomic bombs on Japan. 2.The main countries involved were: Britain, France and Russia against Germany, Austria, Hungary and Poland. war began when Germany invaded Poland. main countries involved were: Britain, Russia and the USA against Germany, Italy and Japan. USA secretly bombed Cambodia during the war. of the battles were fought in Belgium and France. civilians died than soldiers in this war, including 6 million Jews in concentration camps. gas was first used in this war.