As to Florida, that was but the transfer by Spain to the United States of territory on the east side of the river Mississippi in exchange for large territory which the United States transferred to Spain on the west side of that river, as the entire diplomatic history of the transaction serves to demonstrate. Moreover, it was an acquisition demanded by the commercial interests and the security of the whole Union. In the meantime the people of the United States had grown up to a proper consciousness of their strength, and in a brief contest with France and in a second serious war with Great Britain they had shaken off all which remained of undue reverence for Europe, and emerged from the atmosphere of those transatlantic influences which surrounded the infant Republic, and had begun to turn their attention to the full and systematic development of the internal resources of the Union. Among the evanescent controversies of that period the most conspicuous was the question of regulation by Congress of the social condition of the future States to be rounded in the territory of Louisiana. The ordinance for the government of the territory northwest of the river Ohio had contained a provision which prohibited the use of servile labor therein, subject to the condition of the extraditions of fugitives from service due in any other part of the United States. Subsequently to the adoption of the Constitution this provision ceased to remain as a law, for its operation as such was absolutely superseded by the Constitution. But the recollection of the fact excited the zeal of social propagandism in some sections of the Confederation, and when a second State, that of Missouri, came to be formed in the territory of Louisiana proposition was made to extend to the latter territory the restriction originally applied to the country situated between the rivers Ohio and Mississippi. Most questionable as was this proposition in all its constitutional relations, nevertheless it received the sanction of Congress, with some slight modifications of line, to save the existing rights of the intended new State. It was reluctantly acquiesced in by Southern States as a sacrifice to the cause of peace and of the Union, not only of the rights stipulated by the treaty of Louisiana, but of the principle of equality among the States guaranteed by the Constitution. It was received by the Northern States with angry and resentful condemnation and complaint, because it did not concede all which they had exactingly demanded. Having passed through the forms of legislation, it took its place in the statute book, standing open to repeal, like any other act of doubtful constitutionality, subject to be pronounced null and void by the courts of law, and possessing no possible efficacy to control the rights of the States which might thereafter be organized out of any part of the original territory of Louisiana.