Answer:
4. The Magna Carta
5. To keep one branch from dominating the other.
Explanation:
In 1215 the English people passed the Magna Carta making it known that the King/Queen and there government are not above the law.
The checks and balances in the American Constitution were designed to prevent one person, or persons from dominating the government, thats why the president can't do anything without the other 2 branches approval, and vise versa.