aug 8, 1846 - Wilmot Proviso

Description:

An unsuccessful proposal in the United States Congress to ban slavery in territory acquired from Mexico in the Mexican–American War. The conflict over the Wilmot Proviso was one of the major events leading to the American Civil War.

It passed the House but failed in the Senate, where the South had greater representation. It was reintroduced in February 1847 and again passed the House and failed in the Senate.