Kansas–Nebraska Act

The Kansas–Nebraska Act of 1854 (10 Stat. 277) created the territories of Kansas and Nebraska and was drafted by Democratic Senator Stephen A. Douglas of Illinois and President Franklin Pierce. The initial purpose of the Kansas–Nebraska Act was to open up thousands of new farms and make feasible a Midwestern Transcontinental Railroad. The popular sovereignty clause of the law led pro- and anti-slavery elements to flood into Kansas with the goal of voting slavery up or down, resulting in Bleeding Kansas.

The availability of tens of millions of acres of excellent farmland in the area made it necessary to create a territorial infrastructure to allow settlement. Railroad interests were especially eager to start operations since they needed farmers as customers. Four previous attempts to pass legislation had failed. The solution was a bill proposed in January 1854 by Senator Stephen A. Douglas of Illinois. He was the Democratic party leader in the United States Senate, the chairman of the Committee on Territories, an avid promoter of railroads, an aspirant to the presidency, and, above all, a fervent believer in popular sovereignty: the policy of letting the voting (almost exclusively white male) residents of a territory decide whether or not they would permit slavery to exist.

Since early in the 1840s the topic of a transcontinental railroad had been discussed. While there were debates over the specifics, especially the route to be taken, there was a public consensus that such a railroad should be built by private interests financed by public land grants. In 1845, Douglas, serving in his first term in the United States House of Representatives, had submitted an unsuccessful plan to formally organize the Nebraska Territory as the first step in building a railroad with its eastern terminus in Chicago. Railroad proposals were debated in all subsequent sessions of Congress with cities such as Chicago, St. Louis, Quincy, Memphis and New Orleans competing to be the jumping-off point for the construction.

...
Wikipedia