Which rebellion occurred when Pennsylvania farmers protested the heavy taxes on grzain?

The rebellion you are referring to is the Whiskey Rebellion, which occurred in the 1790s. Pennsylvania farmers protested against the federal excise tax on whiskey, which they viewed as unfairly burdensome, particularly for those who relied on distilling grain for their livelihoods. The rebellion highlighted tensions between rural communities and the federal government over taxation and representation. It ultimately tested the new government's ability to enforce its laws and maintain order.