<span>Western and Southern Germany</span>
The phrase that describes the method for making changes or additions to the U.S. Constitution is the amendment process. The writers of the Constitution made sure to include that 2/3 of Congress must agree and approve changes. Also, 3/4 of the states must agree and approve it. Only then can the Constitution be changed. The correct answer is A.
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I believe the thing you are talking about is "checks-and-balances".
This meant that no one 'branch' can overpower the others and become stronger
hope this helps