Free-Soil Party- A minor but influential political party in the pre-Civil War period of American history that opposed the extension of slavery into the western territories.
Fugitive- is someone that has escaped from captivity or is in hiding, an ‘escapee’.
Wilmot Proviso- The Wilmot Proviso was a proposal to prohibit slavery in the territory acquired by the United States at the conclusion of the Mexican War. In 1846, David Wilmot a Democratic member of the United States House of Representatives from Pennsylvania, proposed the Wilmot Proviso.
Answer:
A law can no longer be in effect if Congress passes the law saying it has no effect.
