The potential for violence after passage of the Kansas-Nebraska Act, and indeed episodes of violence, increased on the border between Missouri and Kansas as both Free Soiler and pro-slavery factions began actively arming themselves. An agent of the New England Emigrant Aid Society in Kansas, Charles L. Robinson, requested with some urgency a shipment of several hundred rifles and field guns.(i) Guns were sent to aid Free Soilers in Kansas often with the support of northeastern clergy and their congregations. Thus Sharps Rifles sent by Henry Ward Beecher’s congregation became know as “Beecher Bibles”. Likewise, according to Potter, armed militias from the South began forming to support the pro-slavery cause in Kansas. (i)
ABOUT THE POLITICAL CARTOON: Another Currier satire favoring American party candidate Millard Fillmore. A “buck” (James Buchanan) runs toward the White House, visible in the distance, as the two rival candidates take aim at him with their shotguns. Republican John C. Fremont’s gun explodes (left), as he struggles to free himself from a pool of “Black Mud.” On the far left his two abolitionist supporters Henry Ward Beecher and editor Horace Greeley are also mired in an “Abolition Bog.” Fremont: “Oh! Oh! Oh! I’ve got Jessie this time–” (a puzzling allusion to his wife Jessie Benton). Greeley: “Oh! Brother Beecher! our Kansas Gun has bursted and upset our gunner. I’m afraid we put in too big a load.” Reference is to the Kansas–NebraskaAct of 1854 and the ensuing violence in Kansas, an issue exploited by the Republicans. Beecher: “Confound the Gun! if I can only get out of this muss I’ll stick to preaching and let fire-arms alone.” The oblique reference to Beecher’s part in outfitting armed antislavery emigrants for Kansas is made in more obvious terms in “Col. Fremont’s Last Grand Exploring Expedition in 1856” (no. 1856-20). On “Union Rock” (right), which is square in the path toward the White House, stands Millard Fillmore. He aims his flintlock at Buchanan and says confidently, “Ah! Fremont, your sectional Gun has exploded just as I predicted; but my American rifle will bring down that Old Buck.” MEDIUM: print on wove paper : lithograph ; image 24 x 39 cm. CREATED/PUBLISHED:N.Y. : Published at No. 2 Spruce Street,  Source: Library of Congress
The actual number of free-state settlers that made it to Kansas was far more modest than the expectations set in the press but the perception was in the public psyche.
When the Kansas Territory’s first governor, Andrew Reeder, called for elections of the Kansas Territorial Legislature on March 30, 1855, pro-slavery Missourians crossed the border in droves and took advantage of a poorly conceived suffrage law that required little to no proof of residency to vote. The government they elected was widely recognized as bogus but Reeder let the election stand and President Franklin Pierce endorsed it. The new government created exceptionally pro-slavery laws, some verging on the absurd. Free-state men revolted by setting up their own shadow government in Topeka claiming that its laws and elected officials would become legitimate once statehood was achieved. This exacerbated further the rift between the two factions and opened the door for the Lecompton government to take legal action against the free-soil men, indeed eventually accusing some of treason.
“If one government was valid, the other was spurious, either morally or legally, as the case might be. If the acts of one were binding upon the citizens, then submission to the authority of the other by, for instance, paying its taxes or serving in its militia would constitute sedition, or even treason.” (i)
Eli Thayer of Massachusetts, who had been “aroused very early in the course of the battle in Congress,” incorporated the Massachusetts Emigrant Aid Company with the intent of assisting emigrants who were willing to move west.(i) Details of his “Plan of Operation” found their way into “Horace Greeley’sNew York Tribune where, despite the fact that they presented more dreams than facts, managed to be published and to alarm men in western Missouri.(i)
“…It conjured up in their minds the picture of a vast, wealthy, and overpowering abolitionist organization ready to hurl 20,000 hirelings upon their borders.”(i)
On July 29th, Missourians met in Weston, Missouri and formed the “Platte County Self-Defensive Association” “asserting their readiness to go to Kansas ‘to assist in removing any and all emigrants who go there under the auspices of Northern Emigrant Aid Societies.'”(i) Organization of secret societies followed “including the ‘Blue Lodges,’ and ‘Platte County Regulators.’”(i)
David M. Potter describes “Free Soilers” as “antislavery dissenters within both old parties.”(1)
Michael F. Holt provides an excellent profile of the Northerners who made up the “Free Soil” Party in his description of the delegates, both elected and self-appointed, who attended the first convention of the party in Buffalo.
“Uniformly zealous, they were a heterogeneous lot: Midwestern Democratic proponents of rivers and harbors improvements, which neither party had officially endorsed and Polk had vetoed; labor reformers interested in free homesteads in the West; and even vengeful Clay loyalists from New York City. But most were primarily determined to stop slavery’s spread, and they included three main groups: antislavery Whigs from New England and the Midwest; antislavery Democrats, including New York’s Barnburners; and Liberty men.”(2)
Holt goes on to reinforce that “by itself, antislavery sentiment does not explain who became Free Soilers and who did not.” (3) It varied by state and had much to do with how eager statesmen were to stay with trusted leaders from older existing parties.