Under the Constitution, every State has the right of establishing, and, from time to time, altering its municipal laws and domestic institutions, independently of every other State and of the general government; subject only to the prohibitions and guaranties expressly set forth in the Constitution of the United States. The subjects thus left exclusively to the respective States were not designed or expected to become topics of national agitation. Still, as, under the Constitution, Congress has power to make all needful rules and regulations respecting the Territories of the United States, every new acquisition of territory has led to discussions on the question whether the system of involuntary servitude which prevails in many of the States should or should not be prohibited in that Territory. The periods of excitement from this cause which have heretofore occurred have been safely passed; but during the interval, of whatever length, which may elapse before the admission of the Territories ceded by Mexico as States, it appears probable that similar excitement will prevail to an undue extent. Under these circumstances, I thought, and still think, that it was my duty to endeavor to put it in the power of Congress, by the admission of California and New Mexico as States, to remove all occasion for the unnecessary agitation of the public mind. It is understood that the people of the western part of California have formed a plan of a State Constitution, and will soon submit the same to the judgment of Congress, and apply for admission as a State. This course on their part, though in accordance with, was not adopted exclusively in consequence of, any expression of my wishes inasmuch as measures tending to this end had been promoted by the officers sent there by my predecessor, and were already in active progress of execution before any communication from me reached California. If the proposed Constitution shall, when submitted to Congress, be found to be in compliance with the requisitions of the Constitution of the United States, I earnestly recommend that it may receive the sanction of Congress. The part of California not included in the proposed State of that name is believed to be uninhabited, except in a settlement of our countrymen in the vicinity of Salt Lake.