The northern borderlands of the Spanish colonies are now situated in the south of the United States. This place is rather dry and desertic compared with the centre of Mexico, what used to be the heart of the colonies. They didn't have the means to make it productive land and produce crops, and didn't have the workforce either. Indians living there were nomadic and offered great resistance to Spanish subjugation, the opposite from the tribes living in the centre of Mexico, sedentarian and already used to the dominance of an empire, the Aztec one.
The two reasons that the Spanish lost focus on their northern borderlands was as follows:
1. Spain was fighting revolutionary wars in South America. The wars with the Natives caused Spain to be more focused on the South than on the North.
2. The Northern borderlands were not as attractive to Spain as the South because of a lack of resources, especially gold in those areas.
Thus, given these reasons, Spain had to show reduced interests in the northern borderlands, while she concentrated on areas that offered more wealth and fulfilled her purposes of colonization.
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