They wanted to protect people. All types of power sharing were done in such a way to have various groups of power control and balance each other out. You can see it both in the system of checks and balances of the three power, and in the dual federalism system that was the main one at first.
Answer: something the reader should think, feel or do
If an idea in a non-fiction article is restated by the author that means that the author is trying to emphasize such point. The point or statement that is/are restated might just be the most important point in the article.
He was responsible for writing a famous autobiography.
What about the federal Government? What is it?
They have different histories and orgins, It is also due to the demand and supply of the countries resources.