The main cause of the Peasants' Revolt in England, which erupted in 1381, can be traced back to a combination of social, economic, and political factors. A key trigger was the imposition of a poll tax to fund military campaigns, which disproportionately affected the lower classes. Additionally, ongoing grievances related to feudal obligations, the aftermath of the Black Death that reduced the labor force, and rising tensions between the peasantry and the ruling class contributed to widespread unrest. The revolt was marked by demands for social and economic reforms, but it ultimately failed, leading to a crackdown on dissent and further oppression of the peasantry.