In the period between 1817 and 1819, Mississippi, Illinois, and Alabama were recognized as new states. This rapid expansion resulted in a growing economic divide between the regions and a change of power in Congress to the detriment of the southern states, which viewed their plantation economy, which was dependent on slavery, as increasingly threatened. In February 1819, a bill to enable the people of the Missouri Territory to draft a constitution and form a government preliminary to admission into the Union came before the House of Representatives. During these proceedings, Congressman James Tallmadge, Jr. of New York "tossed a bombshell into the Era of Good Feelings". by offering the Tallmadge Amendment, which prohibited the further introduction of slaves into Missouri and required that all future children of slave parents therein should be free at the age of twenty-five years. After three days of rancorous and sometimes bitter debate, the bill, with Tallmadge's amendments, passed. The measure then went to the Senate, which rejected both amendments.. A House–Senate conference committee proved unable to resolve the disagreements on the bill, and so the entire measure failed. The ensuing debates pitted the northern "restrictionists" (antislavery legislators who wished to bar slavery from the Louisiana territories and prohibit slavery's further expansion) against southern "anti-restrictionists" (proslavery legislators who rejected any interference by Congress inhibiting slavery expansion).
In the period between 1817 and 1819, Mississippi, Illinois, and Alabama were recognized as new states. This rapid expansion resulted in a growing economic divide between the regions and a change of power in Congress to the detriment of the southern states, which viewed their plantation economy, which was dependent on slavery, as increasingly threatened. In February 1819, a bill to enable the people of the Missouri Territory to draft a constitution and form a government preliminary to admission into the Union came before the House of Representatives. During these proceedings, Congressman James Tallmadge, Jr. of New York "tossed a bombshell into the Era of Good Feelings". by offering the Tallmadge Amendment, which prohibited the further introduction of slaves into Missouri and required that all future children of slave parents therein should be free at the age of twenty-five years. After three days of rancorous and sometimes bitter debate, the bill, with Tallmadge's amendments, passed. The measure then went to the Senate, which rejected both amendments.. A House–Senate conference committee proved unable to resolve the disagreements on the bill, and so the entire measure failed. The ensuing debates pitted the northern "restrictionists" (antislavery legislators who wished to bar slavery from the Louisiana territories and prohibit slavery's further expansion) against .southern "anti-restrictionists" (proslavery legislators who rejected any interference by Congress inhibiting slavery expansion).