In this connection it should not be forgotten that when France, of her own accord, resolved, for considerations of the most farsighted sagacity, to cede Louisiana to the United States, and that accession was accepted by the United States, the latter expressly engaged that “the inhabitants of the ceded territory shall be incorporated in the Union of the United States and admitted as soon as possible, according to the principles of the Federal Constitution, to the enjoyment of all the rights, advantages, and immunities of citizens of the United States; and in the meantime they shall be maintained and protected in the free enjoyment of their liberty, property, and the religion which they profess;” that is to say, while it remains in a Territorial condition its inhabitants are maintained and protected in the free enjoyment of their liberty and property, with a right then to pass into the condition of States on a footing of perfect equality with the original States.

The enactment which established the restrictive geographical line was acquiesced in rather than approved by the States of the Union.  It stood on the statute book, however, for a number of years; and the people of the respective States acquiesced in the reenactment of the principle as applied to the State of Texas, and it was proposed to acquiesce in its further application to the territory acquired by the United States from Mexico.  But this proposition was successfully resisted by the representatives from the Northern States, who, regardless of the statute line, insisted upon applying restriction to the new territory generally, whether lying north or south of it, thereby repealing it as a legislative compromise, and, on the part of the North, persistently violating the compact, if compact there was.

Thereupon this enactment ceased to have binding virtue in any sense, whether as respects the North or the South, and so in effect it was treated on the occasion of the admission of the State of California and the organization of the Territories of New Mexico, Utah, and Washington.

Such was the state of this question when the time arrived for the organization of the Territories of Kansas and Nebraska.  In the progress of constitutional inquiry and reflection it had now at length come to be seen clearly that Congress does not possess constitutional power to impose restrictions of this character upon any present or future State of the Union.  In a long series of decisions, on the fullest argument and after the most deliberate consideration, the Supreme Court of the United States had finally determined this point in every form under which the question could arise, whether as affecting public or private rights—­in questions of the public domain, of religion, of navigation, and of servitude.