New Mexico is the name of spain's most successful mainland colony in the first half of the eighteenth century.
This is the term that is used to refer to the areas that the Europeans took over when they came to America. They were the places that came under their command and governance.
The Spaniards were the ones in charge of the administration of New Mexico. Hence we can say that New Mexico is the name of spain's most successful mainland colony in the first half of the eighteenth century.
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