In the same year (1789) North Carolina ceded her western territory (now Tennessee) south of the Ohio, to the United States, providing as one of the conditions of that cession, "that no regulation made, or to be made, by Congress, shall tend to emancipate Slaves." Georgia, also, in 1802, ceded her superfluous territorial domain (south of the Ohio, and now known as Alabama and Mississippi), making as a condition of its acceptance that the Ordinance of '87 "shall, in all its parts, extend to the territory contained in the present act of cession, the article only excepted which forbids Slavery."

Thus while the road was open and had been taken advantage of, at the earliest moment, by the Federal Congress to prohibit Slavery in all the territory north-west of the Ohio River by Congressional enactment, Congress considered itself barred by the very conditions of cession from inhibiting Slavery in the territory lying south of that river. Hence it was that while the spread of Slavery was prevented in the one Section of our outlying territories by Congressional legislation, it was stimulated in the other Section by the enforced absence of such legislation. As a necessary sequence, out of the Territories of the one Section grew more Free States and out of the other more Slave States, and this condition of things had a tendency to array the Free and the Slave States in opposition to each other and to Sectionalize the flames of that Slavery agitation which were thus continually fed.

Upon the admission of Ohio to Statehood in 1803, the remainder of the North-west territory became the Territory of Indiana. The inhabitants of this Territory (now known as the States of Indiana, Illinois, Michigan and Wisconsin), consisting largely of settlers from the Slave States, but chiefly from Virginia and Kentucky, very persistently (in 1803, 1806 and 1807) petitioned Congress for permission to employ Slave Labor, but—although their petitions were favorably reported in most cases by the Committees to which they were referred—without avail, Congress evidently being of opinion that a temporary suspension in this respect of the sixth article of the Ordinance of '87 was "not expedient." These frequent rebuffs by Congress, together with the constantly increasing emigration from the Free States, prevented the taking of any further steps to implant Slavery on the soil of that Territory.

Meanwhile the vast territory included within the Valley of the Mississippi and known at that day as the "Colony of Louisiana," was, in 1803, acquired to the United States by purchase from the French—to whom it had but lately been retroceded by Spain. Both under Spanish and French rule, Slavery had existed throughout this vast yet sparsely populated region. When we acquired it by purchase, it was already there, as an established "institution;" and the Treaty of acquisition not only provided that it should be "incorporated into the Union of the United States, and admitted as soon as possible, according to the principles of the Federal Constitution," but that its inhabitants in the meantime "should be maintained and protected in the free enjoyment of their liberty, property, and the religion which they professed"—and, as "the right of property in man" had really been admitted in practice, if not in theory, by the framers of that Constitution itself—that institution was allowed to remain there. Indeed the sparseness of its population at the time of purchase and the amazing fertility of its soil and adaptability of its climate to Slave Labor, together with the then recent invention by Eli Whitney, of Massachusetts, of that wonderful improvement in the separation of cotton-fibre from its seed, known as the "cotton-gin"—which with the almost simultaneous inventions of Hargreaves, and Arkwright's cotton-spinning machines, and Watt's application of his steam engine, etc., to them, marvelously increased both the cotton supply and demand and completely revolutionized the cotton industry—contributed to rapidly and thickly populate the whole region with white Slave-holders and black Slaves, and to greatly enrich and increase the power of the former.

When Jefferson succeeded in negotiating the cession of that vast and rich domain to the United States, it is not to be supposed that either the allurements of territorial aggrandizement on the one hand, or the impending danger to the continued ascendency of the political party which had elevated him to the Presidency, threatening it from all the irritations with republican France likely to grow out of such near proximity to her Colony, on the other, could have blinded his eyes to the fact that its acquisition must inevitably tend to the spread of that very evil, the contemplation of which, at a later day, wrung from his lips the prophetic words, "I tremble for my Country when I reflect that God is just." It is more reasonable to suppose that, as he believed the ascendency of the Republican party of that day essential to the perpetuity of the Republic itself, and revolted against being driven into an armed alliance with Monarchical England against what he termed "our natural friend," Republican France, he reached the conclusion that the preservation of his Republican principles was of more immediate moment than the question of the perpetuation and increase of human Slavery. Be that as it may, it none the less remains a curious fact that it was to Jefferson, the far-seeing statesman and hater of African Slavery and the author of the Ordinance of 1784—which sought to exclude Slavery from all the Territories of the United States south of, as well as north-west of the Ohio River—that we also owe the acquisition of the vast territory of the Mississippi Valley burdened with Slavery in such shape that only a War, which nearly wrecked our Republic, could get rid of!

Out of that vast and fertile, but Slave-ridden old French Colony of "Louisiana" were developed in due time the rich and flourishing Slave States of Louisiana, Missouri and Arkansas.

It will have been observed that this acquisition of the Colony of Louisiana and the contemporaneous inventions of the cotton-gin, improved cotton-spinning machinery, and the application to it of steam power, had already completely neutralized the wisdom of the Fathers in securing, as they thought, the gradual but certain extinction of Slavery in the United States, by that provision in the Constitution which enabled Congress, after an interval of twenty years, to prohibit the African Slave Trade; and which led the Congress, on March 22, 1794, to pass an Act prohibiting it; to supplement it in 1800 with another Act in the same direction; and on March 2, 1807, to pass another supplemental Act—to take effect January 1, 1808—still more stringent, and covering any such illicit traffic, whether to the United States or with other countries. Never was the adage that, "The best laid schemes o' mice an' men gang aft agley," more painfully apparent. Slaves increased and multiplied within the land, and enriched their white owners to such a degree that, as the years rolled by, instead of compunctions of conscience on the subject of African Slavery in America, the Southern leaders ultimately persuaded themselves to the belief that it was not only moral, and sanctioned by Divine Law, but that to perpetuate it was a philanthropic duty, beneficial to both races! In fact one of them declared it to be "the highest type of civilization."

In 1812, the State of Louisiana, organized from the purchased Colony of the same name, was admitted to the Union, and the balance of the Louisiana purchase was thereafter known as the Territory of Missouri.

In 1818 commenced the heated and protracted struggle in Congress over the admission of the State of Missouri—created from the Territory of that name—as a Slave State, which finally culminated in 1820 in the settlement known thereafter as the "Missouri Compromise."

Briefly stated, that struggle may be said to have consisted in the efforts of the House on the one side, to restrict Slavery in the State of Missouri, and the efforts of the Senate on the other, to give it free rein. The House insisted on a clause in the Act of admission providing, "That the introduction of Slavery or involuntary servitude be prohibited, except for the punishment of crimes whereof the party has been duly convicted; and that all children born within the said State, after the admission thereof into the Union, shall be declared Free at the age of twenty-five years." The Senate resisted it—and the Bill fell. In the meantime, however, a Bill passed both Houses forming the Territory of Arkansas out of that portion of the Territory of Missouri not included in the proposed State of Missouri, without any such restriction upon Slavery. Subsequently, the House having passed a Bill to admit the State of Maine to the Union, the Senate amended it by tacking on a provision authorizing the people of Missouri to organize a State Government, without restriction as to Slavery. The House decidedly refused to accede to the Senate proposition, and the result of the disagreement was a Committee of Conference between the two Houses, and the celebrated "Missouri Compromise," which, in the language of another—[Hon. John Holmes of Massachusetts, of said Committee on Conference, March 2, 1820.]—, was: "that the Senate should give up its combination of Missouri with Maine; that the House should abandon its attempt to restrict Slavery in Missouri; and that both Houses should concur in passing the Bill to admit Missouri as a State, with" a "restriction or proviso, excluding Slavery from all territory north and west of the new State"—that "restriction or proviso" being in these words: "That in all that territory ceded by France to the United States under the name of Louisiana, which lies north of thirty-six degrees, thirty minutes north latitude, excepting only such part thereof as is included within the limits of the State contemplated by this act, Slavery and involuntary servitude, otherwise than in the punishment of crime, whereof the party shall have been duly convicted, shall be and is hereby forever prohibited; Provided always, that any person escaping into the same, from whom labor and service is lawfully claimed in any State or Territory of the United States, such Fugitive may be lawfully reclaimed and conveyed to the person claiming his or her labor or service, as aforesaid." At a subsequent session of Congress, at which Missouri asked admission as a State with a Constitution prohibiting her Legislature from passing emancipation laws, or such as would prevent the immigration of Slaves, while requiring it to enact such as would absolutely prevent the immigration of Free Negroes or Mulattoes, a further Compromise was agreed to by Congress under the inspiration of Mr. Clay, by which it was laid down as a condition precedent to her admission as a State—a condition subsequently complied with—that Missouri must pledge herself that her Legislature should pass no act "by which any of the citizens of either of the States should be excluded from the enjoyment of the privileges and immunities to which they are entitled under the Constitution of the United States."