The Kansas-Nebraska Act of 1854 not only created the territories of Kansas and Nebraska, but also repealed the Missouri Compromise of 1820 and allowed the territory settlers to determine if they would allow slavery within their boundaries. Though the initial purpose of the Kansas-Nebraska Act was to create opportunities for a transcontinental railroad, that changed with the struggles between the north and south for dominance on the issue of slavery.

Numerous debates were held before the act was passed in Congress, during which time the northern states determined that the only way to rescue the new territory of Kansas from pro-slavery advocates was to send numerous northern emigrants into the territory to establish as a free state. Before the Kansas-Nebraska Bill was even passed, several Emigrant Aid Societies were formed, primarily in New England, to populate the state with anti-slavery proponents.

Leading the charge was a Massachusetts House of Representatives politician named Eli Thayer, who formed the Massachusetts Emigrant Aid Company, which provided for plan to raise capital to offer inducements to anti-slavery emigrants sufficient to offset the hardships of frontier life. Thayer's plan worked and before long a number of other Emigrant Aid societies were formed, sending thousands of emigrants from free states, including New England, Iowa, Ohio, and other Midwestern states into Kansas Territory.

These emigrants were known as Free-Staters, who quickly established a number of new settlements such as Lawrence, Topeka, and Manhattan. By the time they arrived, there were already a number of settlements that had been formed by pro-slavery “squatters,” including Atchison, Lecompton, and others.

To protect themselves against the pro-slavery advocates, the Free-Staters formed several organizations including the "Actual Settlers' Association of Kansas Territory," which held its first meeting on August 12, 1854 to adopt regulations that would protect them from the pro-slavery squatters.  

In January, 1855, a small group of men in the politically charged town of Lawrence organized the "Free State Society" with the objective of “using all its influence for the prohibition of slavery in Kansas."

On May 30, 1855, an election was held to establish the Kansas Legislature, which was won and organized by pro-slavery advocates, primarily due to hundreds of non-residents flooding over the Missouri state line and “stuffing” the ballot boxes. The “Free-Staters” were obviously incensed, but the U.S. Federal Government recognized the new territorial government, which the Free-Staters referred to as the “Bogus Legislature.”