The role of judicial review in American constitutional government is so that the court systems (judicial branch) can make sure that any law passed by Congress does not interfere with the Constitution.
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Most African Americans lived freely in the North. People in the South were trying to escape to freedom to the North since they were slaves there and they were treated badly
Since the countries were becoming industrialized, they needed more and more resources. Since they couldn't have them in their own countries, they had to conquer others. That's why they would make colonies and spread their empires. That way they could take coal or oil or lumber or similar things from the colony and use it for their own purposes. Usually, they would leave nothing to the colony.
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I'm sorry, I don't know the answer to that, why don't you read the paragraph about it, write what you learned, and think about it, and you might know.
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