Why The free soil party promised to?

The Free Soil Party, established in the mid-19th century, promised to oppose the expansion of slavery into the western territories of the United States. Their platform emphasized the belief that free men on free soil comprised a morally and economically superior system to slavery. By advocating for "free soil, free labor, and free men," they aimed to protect the opportunities for white settlers and promote the idea of a free labor economy, appealing to both abolitionists and those concerned about the competition posed by slave labor. Ultimately, their stance played a significant role in shaping the political landscape leading up to the Civil War.