In 1826, when a state committee proposed abolishing slavery outright, 25 percent of the people in Austin's colony were slaves. Austin's colonists, mostly pro-slavery immigrants from the south, threatened to leave Texas if the proposition passed, while prospective Southern immigrants hesitated to come to Texas until slavery was guaranteed there. Austin conceded that the success of his colony was dependent on slavery. Without slaves, the colonists would lack the mass labor to cultivate the land, which would stall the pace of immigration needed to develop and increase the value of the land, which would deflate the economy and motivate his colonists to leave.