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Mercenaries became obsolete because of gunpowder.

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Gunpowder gave an arabesque the ability to shoot once or twice in one minute

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Gunpowder was used in firearms which only took a few weeks to learn how to use.

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Gunpowder was first used in Europe in 1346.

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Gunpowder was used in fireworks.

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I believe gunpowder is important because when it was used in guns, it took less time to train someone to use it versus a pike.

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Gunpowder is important because it could make more advanced weapons back then.

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I think gunpowder is important because you could make fireworks with it and have celebrations.

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Gunpowder is important because it could take down a fortress a lot easier than people trying to invade.

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I believe gunpowder is the most important because if it wasn't invented, wars would be a lot slower.