The Bill authorizing Missouri to act was taken up in the House on February 13, 1819, and immediately Mr. Tallmadge, of New York, moved that the further introduction of slavery in Missouri be prohibited, and that children born in the State after its admission should be free at the age of twenty-five years. Instantly and unexpectedly an exciting, violent debate took place between the North and South. Neither professed to understand the position of the other, but the North was more sincerely astonished, because for the first time she realized what the South had intended for many years, that slavery should be made a permanent institution in the original States, and that it should be forced into the Missouri Territory as a matter of political necessity; because the extension of slave area had by this time become absolutely necessary for the interests of the South. It was a plain proposition that if the South lost control of the legislative reins at Washington, slavery would eventually be doomed by adverse legislation and by the admission of free States. At the time the Missouri question came up, the North, by reason of her larger population, controlled the House, but the Senate was controlled by the South. The censuses taken in 1800 and 1810 had shown that the North was increasing two to one in population over the South, and the coming census, it was feared, would show a much larger increase in favor of the North; in fact, when the census for 1820 was published the division of the population was as follows: Free White. Negroes. Slaves. North .......... 5,030,371 99,281 19,108 South .......... 2,831,560 134,223 1,519,017 With a great moral weakness to justify, the South now knew herself to be growing physically weaker, and her skillful leaders, always alert on every phase of slavery, saw quickly that the South must insist upon more slave territory, not only to maintain the equilibrium in the Senate, but to counteract the growing population in the North. Therefore the Missouri question was pressed with violence, threat and strategy. The South was determined that Missouri should come in as a slave State or the South would secede from the Union; the North not only argued that slavery was a great wrong, not to be encouraged by its extension, but was equally determined that the South should have no more political advantage because of her slaves. "This momentous question," wrote Jefferson, "like a fire-bell in the night, awakened and filled me with terror." With the two Sections dead-locked, nothing could take place but the most acrimonious debates, accompanied by threats and defiances. The House adopted the Tallmadge Amendment, but it was rejected by the Senate. Neither branch would recede from its position, and amid scenes of the greatest excitement in Washington and throughout the country, the Fifteenth Congress adjourned.