Lesson 1: A Union in Danger

Lesson Focus

Acquiring new land after the Mexican War forced a national crisis. This lesson explores how the question of expanding slavery into these territories pushed the United States to the brink, setting the stage for major political conflict.

People to Know

Henry Clay, Stephen A. Douglas

Learning Objectives

• Analyze how the issue of slavery impacted the 1848 presidential election and led to the rise of the Free Soil party.
• Understand why California's application for statehood as a free state sparked intense debates over the balance of power between North and South.
• Describe the key provisions of the Compromise of 1850 and explain how it temporarily resolved the crisis over slavery's expansion.

After the Mexican War, the question of slavery in new territories created a crisis.

The House of Representatives passed the Wilmot Proviso to ban slavery in all lands acquired from Mexico.

However, the Senate defeated the bill, with southerners arguing it violated their property rights. This bitter disagreement over congressional power left the nation deeply divided and the future of slavery in the new territories completely unresolved by the end of the Polk administration.

The major parties tried to avoid the slavery issue in the 1848 election.

Democrats nominated Lewis Cass, who favored popular sovereignty, while the Whigs nominated war hero Zachary Taylor and ignored the topic.

In response, antislavery groups formed the Free Soil party. By splitting the Democratic vote in New York, the Free Soilers unintentionally helped Zachary Taylor win the presidency, proving the slavery issue could not be suppressed.

The 1848 gold discovery caused a massive influx of "Forty-niners" to California, creating a desperate need for an organized government.

By 1849, Californians adopted a constitution that banned slavery and applied for admission as a free state.

This application triggered a crisis in Congress, as admitting California would upset the Senate's balance of power between free and slave states, prompting southern threats of leaving the Union.

To prevent the Union from dissolving over the California crisis, Senator Henry Clay proposed a great compromise.
His plan offered concessions to both sides:

• For the North: California admitted as a free state.
• For the South: A stronger Fugitive Slave Law.

He also proposed that the territories of New Mexico and Utah decide the slavery question through popular sovereignty. Pay special attention to how this plan balanced competing demands.

Clay's original compromise bill failed, but President Zachary Taylor's death in the summer of 1850 brought a supporter, Millard Fillmore, to power.

Senator Stephen A. Douglas then cleverly broke the plan into five separate bills, allowing different groups of senators to vote for the parts they supported.

This strategy worked, and the bills passed, becoming the Compromise of 1850. It temporarily averted disaster but did not create a lasting peace.