Serfs may eventually work their way to freedom (usually not), if you know the term tenant farmers, individuals who work on a property with some believe that eventually they may pay their debts off and become a freeman. An enslaved person, will never believe that they will eventually become free.
-My opinion anyway (probably wrong) but worth a try.
New freedmen tended to be poor and less educated.
Bacon's Rebellion (1676), Pueblo's Revolt (1680), Salem Witchcraft Trials (1692), and Stono Rebellion (1739). ... Moreover, Bacon wished to “extirpate all Indians.” Native American attacks on colonists, however, were not unprovoked.