What is the main reason spanish built missions along the barrier islands?

The main Spanish missions were built on the barrier islands off the coast of Georgia were to convert the Native Americans to the Catholic faith, a branch of Christianity. This would allow the Spanish to settle and colonize the region and help future trade and exploration efforts.

Explanation:

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To convert the Native Americans to the catholic faith, a branch of Christianity

Explanation:

This would allow the Spanish to settle and colonize the region and help future trade and exploration efforts.