The answer is A i believe!! :)
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A. Disputes over land is the answer this is because there were native Americans on the land and they had to own all of the land and all of the people had to agree to this.
Hope this helps!
The correct answer is mnemonic.
This is an example of a mnemonic because this phrase has been used as a way to remember an important historical event, which in this case was Christopher Columbus's first voyage to the New World. Any phrase or sentence structured to help someone remember an important event is considered a mnemonic device.