Since World War II, the United States has engaged in military hostilities roughly 150 times and usually at the instigation of the House of representatives. American led the world in arms production.
During the World war II some amerians served in the United States armed forces. U.S. entered in the world war II by Japanese attack on pearl harbor on 7th December and their intervention in both pacific and european theaters of world war II.
The U.S. was providing its allies in the Great Bratain and also the Soviet Union with necessary supplies. Many volunteered defend their nation from enemy bombing or invasion.
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