As southern states began seceding during the winter of 1860–61, several compromises were proposed to hold the nation together. One was a constitutional amendment that would have prevented Congress from passing legislation interfering with a state’s “domestic institutions . . . including that of persons held to labor or service.” Amendment sponsors hoped its approval would keep border states in the Union and reassure southerners that Republicans opposed only the extension, not the existence, of slavery. Congress approved the amendment, but only two state legislatures ratified it."
National Archives, General Records of the U.S. Government