How did Henry Clay help the country avert war for thirty years?

Clay became known as "The Great Compromiser" for his work to avoid civil war, even though it was only helped preserve the Union for a few decades.

Explanation:

The sectional compromises formulated by him (the Missouri Compromise of 1820, the Tariff Compromise of 1833, and the Compromise of 1850) were aimed to bring moderation into the sectional conflicts and to work in a gradual abolition of slavery.

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