They had a program of action. Abraham Lincoln migrated from Kentucky to Indiana and to Illinois. Jefferson Davis moved from Kentucky to Louisiana, and thence to Mississippi, in the same period. Starting from the same locality, each represented the divergent flow of streams of settlement into contrasted environments. The result of these antagonistic streams of migration to the West was a struggle between the Lake and Prairie plainsmen, on the one side, and the Gulf plainsmen, on the other, for the possession of the Mississippi Valley. It was the crucial part of the struggle between the Northern and Southern sections of the nation. What gave slavery and State sovereignty their power as issues was the fact that they involved the question of dominance over common territory in an expanding nation. The place of the Middle West in the origin and settlement of the great slavery struggle is of the highest significance. In the early history of Ohio, Indiana, and Illinois, a modified form of slavery existed under a system of indenture of the colored servant; and the effort of Southern settlers in Indiana and in Illinois to reintroduce slavery are indicative of the importance of the pro-slavery element in the Northwest. But the most significant early manifestation of the rival currents of migration with respect to slavery is seen in the contest which culminated in the Missouri Compromise. The historical obstacle of the Ordinance, as well as natural conditions, gave an advantage to the anti-slavery settlers northwest of the Ohio; but when the Mississippi was crossed, and the rival streams of settlement mingled in the area of the Louisiana Purchase, the struggle followed. It was an Illinois man, with constituents in both currents of settlement, who introduced the Missouri Compromise, which made a _modus vivendi_ for the Middle West, until the Compromise of 1850 gave to Senator Douglas of Illinois, in 1854, the opportunity to reopen the issue by his Kansas-Nebraska bill. In his doctrine of "squatter-sovereignty," or the right of the territories to determine the question of slavery within their bounds, Douglas utilized a favorite Western political idea, one which Cass of Michigan had promulgated before. Douglas set the love of the Middle West for local self-government against its preponderant antipathy to the spread of slavery. At the same time he brought to the support of the doctrine the Democratic party, which ever since the days of Andrew Jackson had voiced the love of the frontier for individualism and for popular power. In his "Young America" doctrines Douglas had also made himself the spokesman of Western expansive tendencies. He thus found important sources of popular support when he invoked the localism of his section. Western appeals to Congress for aid in internal improvements, protective tariffs, and land grants had been indications of nationalism. The doctrine of squatter-sovereignty itself catered to