This new political party was formed to halt the spread of slavery to new territories a. whig b. democrat c. republican d. know-nothing

Explanation:

In Ripon, Wisconsin, former members of the Whig Party meet to establish a new party to oppose the spread of slavery into the western territories. The Whig Party, which was formed in 1834 to oppose the “tyranny” of President Andrew Jackson, had shown itself incapable of coping with the national crisis over slavery.

With the successful introduction of the Kansas-Nebraska Bill of 1854, an act that dissolved the terms of the Missouri Compromise and allowed slave or free status to be decided in the territories by popular sovereignty, the Whigs disintegrated. By February 1854, anti-slavery Whigs had begun meeting in the upper midwestern states to discuss the formation of a new party. One such meeting, in Wisconsin on March 20, 1854, is generally remembered as the founding meeting of the Republican Party.