Owny were missions and presidios always close to each other?

These missions were to be under the protection of the Presidio de San Luis de las Amarillas, or Presidio de San Sabá, as it came to be called. ... They wanted new missions to the west of the presidio as way-stations between Texas and New Mexico.

Explanation:

The difference between a mission and a presidio is that a mission is a religious settlement and a presidio is a Spanish military and the presidio was an out post that protected land.

Hope this helps

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