Final answer:
The direct cause of the Whiskey Rebellion was the tax imposed on whiskey by the US government in 1791.
Step-by-step explanation:
The direct cause of the Whiskey Rebellion was the tax that was imposed on whiskey by the US government in 1791. In order to generate revenue to pay off the country's debts after the American Revolution, the government placed a tax on distilled spirits, which primarily affected whiskey producers. This tax was seen as unfair and burdensome by many farmers and frontiersmen, as whiskey was a crucial part of their economy and way of life.
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