The Peterloo Massacre took place at St Peter's Field, Manchester, England, on Monday 16 August 1819. Eighteen people were killed and 400–700 were injured when the cavalry of the Yeomen charged into a crowd of around 60,000 people who had gathered to demand the reform of parliamentary representation. After the end of the Napoleonic Wars in 1815, there was an acute economic slump, accompanied by chronic unemployment and harvest failure due to the Year Without a Summer, and worsened by the Corn Laws, which kept the price of bread high.

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