Edited sentence: Fed from troughs like livestock and forced to labor for their european masters, the indians were forbidden to speak in their native languages or practice their traditions.It is estimated that the native population of Central California dropped by over 80% within 100 years of the arrival of the Spanish.Many of the conversions were by force, and once in residence at the mission, native americans were held as virtual prisoners.Unmarked graves immediately outside of the walls of the Mission hold the remains of at least three thousand indians