Passed by Congress in 1854, the Kansas-Nebraska Act has been called the most momentous piece of legislation in the United States before the American Civil War. It set in motion events that led directly to the conflict over slavery.
In January 1854, with the support of President Franklin Pierce, Senator Stephen A. Douglas of Illinois laid before the Senate a report of the Committee on Territories. This provided for the organization of the territories of Kansas and Nebraska. The bill allowed the people of these regions to decide whether they would allow slavery within their borders. The bill as finally enacted into a law expressly repealed the Missouri Compromise, which had prohibited slavery north of latitude 36o 30'. A whole generation had regarded the Missouri Compromise as a binding agreement between the North and the South.
The news that such an act was being considered fell like a thunderbolt upon the people of the North. Ministers preached against the "Nebraska iniquity," and Douglas was accused of weakly yielding to the South in the hope of winning the presidency.
In spite of Northern anger, Congress passed the bill on May 30, 1854. The fight over slavery was then transferred to the two territories. Proslavery supporters of the South and antislavery supporters of the North rushed into Kansas. Each side determined to win the state. The first elections, in 1855, were carried by the settlers from the South, aided by the "border ruffians" of Missouri. They crossed the border the night before election and seized the polls, illegally casting their votes for a proslavery candidate for governor.
The settlers from the North refused to accept the results of this fraudulent election. They held an election of their own, at which the proslavery supporters refused to vote. As a result two rival governments were set up in the territory, and a civil war began. The antislavery party under the leadership of John Brown returned violence for the violence of the proslavery supporters. The attention of the whole country was fixed on "bleeding Kansas."
The settlers from the South were supported by President Pierce. Eventually he sent federal troops into the territory to quell the disturbance and to disperse the free-state legislature. A new election was then called. Again the illegal methods of the proslavery party won the day. Congress refused to recognize the constitution adopted by such methods as legal, and Kansas was forced to remain a territory.
As time went on, the free-state settlers became more numerous, and finally the South gave up the attempt to make Kansas a slave state. A new constitution was then drawn up, and on Jan. 29, 1861, on the eve of the Civil War, Kansas was admitted to the Union as a free state.