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The first ever machine gun was made in the united states.

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Richard Jordan Gatling invented the machine gun.

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The machine gun was invented because a man told Richard that if he wanted to make a fortune to create a machine so that the Europeans kill each other. So he did and and sold his machine guns to Europeans on the eve of WW1.

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The machine gun changed warfare because the machine gun would fire 600 rounds per minute. And it took about 2 minutes too reload which was more convenient in battle.