By 1819, the area west of the Mississippi River, known as the Missouri Territory, had obtained a population qualifying it to be admitted to the Union. Daniel Walker Howe, What Hath God Wrought: Transformation of America, 1819-1848, 147. The only requirement to be admitted was that an enabling act be presented to Congress “authorizing Missouri voters to elect a convention to draft a state constitution.” Id. That bill was proposed, but Representative James Tallmadge proposed an amendment prohibiting further “importation of slavery” and “all children of slaves born after Missouri’s admission to the Union should become free at the age of twenty-five.” Id. This provoked great “consternation in the House of Representatives.” Id. citing Annals of Congress, 15th Cong., 2nd sess., 1170.
Last Best Hope of Earth 