was the wilmot proviso ever passed
Rating Newest Oldest. Best Answer: The Wilmot Proviso, first suggested in 1846 and attached to many bills but never passed, would have outlawed slavery in any U.S. territory gained from the Mexican Cession following the recently begun Mexican-American War.he proviso was named for Congressman David Wilmot of Pennsylvania. The Free Soil Party formed in support of the Wilmot Proviso, and their platform of Free Soil was later adopted by the Republican Party.