It was never seriously considered. It was not used because it would have been to hard, as there was many failed attempts at it before.
Answer:
The Spanish established 21 religious outposts in California to covert the Native Americans. The missions were founded by the Catholic priests of Franciscan order. The missionaries for the native Americans to live in the settlements (Reductions) destroying their traditional way of life and influencing religion,culture, architecture, language and economy of the region, they forced the native to change themselves to match with the modernity. they also brought European fruits, cattle, vegetables, horses and ranching technology.
Historians blame the mission for the oppression and abuse to transform them into Spanish colonial citizens.
Early farmers who cultivated crops and domesticated animals faced a greater risk of early death due to water contamination and animal-borne diseases.
