Before the bill was returned to the House , a second amendment was adopted on the motion of Jesse B. Thomas of Illinois , excluding slavery from the Louisiana Territory north of the parallel 36 ° 30 ′ north ( the southern boundary of Missouri ) , except within the limits of the proposed state of Missouri .
Before the bill was returned to the House , a second amendment was adopted on the motion of Jesse B. Thomas of Illinois , excluding slavery from the Missouri Territory north of the parallel 36 ° 30 ' north ( the southern boundary of Missouri ) , except within the limits of the proposed state of Missouri .