Spain found missions and presidios A. to convert American Indians to Christianity, and C. to teach American Indians how to live as Spanish colonist.
It was a way to try that the Indians become sedentarian in the frontier of the Empire. The missionaries often learnt about the Indian culture in order to teach them Christianity in a way they would understand, but it was a non-planned effect of the establishment of missions. I any case they would want the Indians to become soldiers, because they might have turned against them.
Comparative advantage I would think. Yep, Google-sensei confirmed it:) Comparative advantage is the answer.
Answer:
It was considered disloyal to America.
The fear of increased cost
The need for skilled workers
Encounters between European navigators, explorers, conquerors, colonizers, merchants, missionaries and "other" peoples and cultures over the course of 4 centuries. At an immediate and practical level, conquest, colonization and trade led to modes of domination or coexistence and multi-faceted transcultural relationships. In Europe, such encounters with "otherness" led to attempts to explain and interpret the origins and nature of racial and cultural (linguistic, religious and social) diversity. At the same time, observation of alien societies, cultures and religious practices broadened the debate on human social forms, leading to a critical reappraisal of European Christian civilization.