Freedom suits were lawsuits in the Thirteen Colonies and the United States filed by slaves against slaveholders to assert claims to freedom, often based on descent from a free maternal ancestor, or time held as a resident in a free state or territory.
The right to petition for freedom descended from English common law and allowed people to challenge their enslavement or indenture. Petitioners challenged slavery both directly and indirectly, even if slaveholders generally viewed such petitions as a means to uphold rather than undermine slavery. Beginning with the colonies in North America, legislatures enacted slave laws that created a legal basis for "just subjection"; these were adopted or updated by the state and territorial legislatures that superseded them after the United States gained independence. These codes also enabled enslaved persons to sue for freedom based on wrongful enslavement.