Why was the Free Soil Party formed and what was their slogan?

The group of Free soil initiated movement or was originated after the Liberty Party ended after its poor performance in the 1844 leadership contest. Thy criticized the extension of slavery into any new territories or states because of fear of competitiveness with Southern slaveholders.

Usually, they claimed that the state could not abolish slavery where it already occurred but could limit slavery in new locations. The northerners who wished to buy property in the West feared they couldn't deal with slave labour financially. It contributed to the call for free labour by the party. Thus the motto of the Free Soil Party reflects the participants mission of "free soil, free speech, free labor, and free men".