Answer:
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 center 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.
Explanation:
A convention of delegates from all the states except Rhode Island met in Philadelphia, Pennsylvania, in May of 1787. Known as the Constitutional Convention, at this meeting it was decided that the best solution to the young country's problems was to set aside the Articles of Confederation and write a new constitution.
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Battle of Saratoga is the answer