The debate upon the measure developed the existence, in the North, of a growing hostile sentiment toward slavery, which confirmed in the minds of Southern statesmen the necessity of keeping the number of Slave States equal, at least, with the number of Free States; for only by thus maintaining a balance of power in the Senate, could legislation adverse to slavery be prevented. Also, the limitations of the compromise agreement emphasized a further necessity; the acquisition of additional territory south of 36° 30' from which Slave States could be created in the future, to balance the admission into the Union of prospective Free States. This resulted in a propaganda for territorial expansion southward. In pursuance of such policy, the revolt against Mexico, by Texas, was probably encouraged.[60] In discussing the recognition of the Republic of Texas, in January, 1836, Mr. Calhoun said, "It prepared the way for the speedy admission of Texas into the Union, which would be a necessity to the proper balance of power in the Union between the slave-holding and non-slave-holding Commonwealths, upon which the preservation of the Union and the perpetuation of its institutions rested.[61] The State of Vermont "apprehended that the political strength which the annexation of Texas would give to the slave-holding interests, would soon lead to a dissolution of the Union, or to the political degradation of the Free States"; and, in pursuance of that apprehension the "Legislature of Vermont adopted a set of resolutions protesting against the annexation of Texas or the admission of any Slave State into the Union," which was presented in Congress.[62] Having respect for Northern sentiment, Congress kept Florida waiting six years: until Iowa was ready to come into the Union.[63] The South consented readily to the settlement of the "Oregon Boundary Question" at 49° north latitude instead of 54° 40'. In fact, at the time the Democratic National Convention of 1844 declared our title to the whole of Oregon as far as 54° 40' to be "clear and unquestionable," Mr. Calhoun, secretary of state, had proposed to Her Majesty's representative to settle the controversy by adopting the 49th parallel as the boundary.[64] Texas was admitted into the Union; the articles of annexation providing that it might be subdivided into five states, at any time it chose to make such division. Also, after a war of conquest with Mexico, Upper California and New Mexico were added to the public domain.