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The first chemical weapons that were used were poisonous arrows used way back during the French and Indian war
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The use of actuall chemical agents were just starting to be used in world war 1 when both size used chemical gases
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In 1925 the geneova protocol was signed banning the use of these weapons in the time of warfare
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Although the geneva was signed poison gases was still used in Nazi concentration camps
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By the 1970s lots of countries were developing chemical weapons
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After world 2 chemical weapons weren't used in battles not until the Iraq war when Iraq fought its government
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The CWC (chemical weapon convention) was put into force, which disarmed multiple weapons and all countries