There was, too, this vital difference between squatter sovereignty in Utah and New Mexico and popular sovereignty in Nebraska and Kansas: the former were at least partially inhabited and enjoyed some degree of social and political order; the latter were practically uninhabited. It was one thing to grant control over all domestic concerns to a population _in esse_, and another and quite different thing to grant control to a people _in posse_. In the Kansas-Nebraska Act hypothetical communities were endowed with the capacity of self-government, and told to decide for themselves a question which would become a burning issue the very moment that the first settlers set foot in the Territories. Congress attempted thus to solve an equation without a single known quantity. Moreover, slavery was no longer a matter of local concern. Doubtless it was once so regarded; but the time had passed when the conscience of the North would acquiesce in a _laissez faire_ policy. By force of circumstances slavery had become a national issue. Ardent haters of the institution were not willing that its extension or restriction should be left to a fraction of the nation, artificially organized as a Territory. The Kansas-Nebraska Act prejudiced the minds of many against the doctrine, however sound in theory it may have seemed, by unsettling what the North regarded as its vested right in the free territory north of the line of the Missouri Compromise. The Act made the political atmosphere electric. The conditions for obtaining a calm, dispassionate judgment on the domestic concern of chief interest, were altogether lacking. It was everywhere conceded that Nebraska would be a free Territory. The eyes of the nation were focused upon Kansas, which was from the first debatable ground. A rush of settlers from the Northwest joined by pioneers from Kentucky and Missouri followed the opening up of the new lands. As Douglas had foretold, the tide of immigration held back by Indian treaties now poured in. The characteristic features of American colonization seemed about to repeat themselves. So far the movement of population was for the most part spontaneous. Land-hunger, not the political destiny of the West, drove men to locate their claims on the Kansas and the Missouri. By midsummer colonists of a somewhat different stripe appeared. Sent out under the auspices of the Emigrant Aid Company, they were to win Kansas for freedom at the same time that they subdued the wilderness. It was a species of assisted emigration which was new in the history of American colonization, outside the annals of missionary effort. The chief promoter of this enterprise was a thrifty, Massachusetts Yankee, who saw no reason why crusading and business should not go hand in hand. Kansas might be wrested from the slave-power at the same time that returns on invested funds were secured.