The Crittenden Compromise was an unsuccessful proposal to permanently enshrine slavery in the United States Constitution, and thereby make it unconstitutional for future congresses to end slavery. It was introduced by United States Senator John J. Crittenden (Constitutional Unionist of Kentucky) on December 18, 1860. It aimed to resolve the secession crisis of 1860–1861 that eventually led to the American Civil War by addressing the fears and grievances of Southern pro-slavery factions, and by quashing anti-slavery activities.