The answer is the Amritsar Massacre. The said massacre happened on April 13, 1919. Pilgrims and protesters were not aware of the ongoing martial law in Punjab. They were gathered to celebrate a religious festival of the Baisakhi people when suddenly they were killed by the British Indian Army which was led by Colonel Reginald Dyers.
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Answer:
Europeans believed they were better, and therefore they had more resources and had slave trade because they saw themselves as superior.
They sprayed Agent orange, which is now known to cause cancer and be extremely dangerous
