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The fact that the government is divided into three branches is known as the "division of power" - the power is distributed to avoid power abuse, so that no instance has unlimited power.
The fact that the three branches are overlapping is known as "checks and balances" - the branches check the other ones (whether their function is lawful) and balance each other.
B) Plain Native Americans benefited from the horse
Well maybe they hate war since there all about peace with life they want a world with no war