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During WW1, military used chlorine gas at Belgium. It cause 90000 death,1000000 people casualties and many blinded for life
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Chemical Weapons were banned by League of Nations in 1925, they draft the Geneva Protocol. It become effective at 1928
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During 1932-1942 in Manchuria. Japanese military tests of bioweapon agents on prisoners, it cause 1000 death and 200 injury.
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German government use gas chambers to kill camp prisoners, mostly Jews. 1600000 people were killed
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The U.S. Military Dumped 20 Million Gallons of Chemicals on Vietnam from 1962 – 1971 during Vietnam War. 400,000 people were killed or maimed,500,000 babies have been born with birth defects, and 2 million have suffered from cancer or other illnesses.
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Iraqi military use chemical weapons like mustard gas to kill Iranian soldiers and civilians, it cause 21000 death and 92000 injury.
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It was happened in India. The pesticide plant accidental released cyanide and it cause 3787 death and 500000+ injury.
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1,000kg of the deadly nerve agent sarin had been dropped on the rebel held suburbs of Ghouta Syria, killed upward of 1000 mainly woman and child.