The ones who controlled the territories would have the main political power in the congress. If the states were slave states then it would bother non-slave states in the congress, and vice versa. That's why it was necessary to create new states that weren't the former Mexican ones that would help balance out the power of the two factions.
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the fall of the berlin wall symbolizes the end of communism in europe.
hope this helps, God bless!
The greeks were once ruled by an oligarchy. hoped i helped :D