Final answer:
Spain allowed missions to be built in Texas to spread Christianity, establish Spanish presence, and protect Spanish territories.
Step-by-step explanation:
In the 16th century, Spain began establishing missions in California, New Mexico, and Texas for several reasons. One of the main reasons was to spread Christianity among the indigenous populations. The Spanish saw the missions as a way to convert Native Americans to Catholicism and bring them under Spanish influence. Additionally, the missions served as a means to claim and establish Spanish presence in these areas and to protect Spanish territories from the encroachment of other European powers.
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