The Department of War was one of the first executive branch departments in the u.s. government.
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The American Revolution was principally caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War.
It helped because America did not need to worry about ammo the the british
Stalin signed a nonaggression pact with Germany because he knew that Europe was on the brink of another major war, and he wanted time to be able to build up the Soviet military.