Iroquois' political alliance even before the arrival of European colonists was the most durable in spite of the disastrous changes brought on by European contact. During the American Revolution, the Confederacy fell apart for the first time since its creation as various Iroquois groups fought against one another.
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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:
Failed leadership of the united states can failed policies put in place by the president can be considered a cause