Someone who is indentured is essentially a slave, but they are working to pay off a debt they have with their owner or boss. Indentured workers have more rights in later years, and will most likely pay off their debts and be free.
At his is because they weren't going to listen to them
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.