America's Great Debate: Henry Clay, Stephen A. Douglas, and the Compromise That Preserved the Union

The Mexican War introduced vast new territories into the United States, among them California and the present-day Southwest. When gold was discovered in California in the great Gold Rush of 1849, the population swelled, and settlers petitioned for admission to the Union. But the U.S. Senate was precariously balanced with fifteen free states and fifteen slave states. Up to this point, states had been admitted in pairs, one free and one slave, to preserve that tenuous balance in the Senate. W...