Final answer:
The farmers shut down the courthouses during Shay's Rebellion in protest against heavy taxes and unfair treatment by the courts.
Step-by-step explanation:
The farmers shut down the courthouses during Shay's Rebellion because they were angry about being heavily taxed and facing foreclosure on their farms. They believed that the courts were biased in favor of the wealthy creditors and were not providing them with fair treatment. By shutting down the courthouses, the farmers aimed to disrupt the legal proceedings and prevent any further actions against them.
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