Connection #3 emphasizes the intricate connections between several pivotal happenings and individuals in mid-19th century American history, particularly in relation to territorial expansion and the divisive issue of slavery. James K. Polk, who held the presidency from 1845 to 1849, was an ardent supporter of Manifest Destiny, which inspired the nation’s westward movement and culminated in the Mexican-American War (1846-1848). The aftermath of the conflict resulted in substantial territorial acquisitions for the United States; however, it sparked renewed debates about whether the newly acquired regions should permit slavery.
This growing conflict set the stage for the Compromise of 1850, an effort to mediate the status of lands gained through the war. While it resulted in California being admitted as a free state, it also opened the door for the potential establishment of slavery in New Mexico and Utah territories. Yet, this solution failed to quell the ongoing disputes over slavery, leading to the Kansas-Nebraska Act of 1854. This legislation introduced the idea of popular sovereignty, granting settlers in those regions the power to determine whether they would allow slavery.
These developments reveal a clear cause-and-effect dynamic in which the ambitions for territorial growth exacerbated the existing clashes over slavery. This interplay underscores the overarching themes of American expansionism and increasing sectional divisions, which would ultimately play a significant role in the onset of the Civil War.