Answer:
A president can only seve 2 terms because at on point they will grow old and they can get bored of the job and people might not like the President so then they can vote again and not have the same President.
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A confederacy, since rather than a single unified body it is a confederation of states or provinces.
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I believe the answer is self-concept
B Of course, the real drawback to traveling to Mars is the lack of cell phone reception.