The power of the three branches is limited by ?

Separation of Powers in the United States is associated with the Checks and Balances system. The Checks and Balances system provides each branch of government with individual powers to check the other branches and prevent any one branch from becoming too powerful.

Explanation:

theodore roosevelt challenged william to a duel, whoever won, got their policy sent to congress. it ended up in a stalemate, and both men were injured and sent to the hospital.

these civilizations were located around fertile rivers, where they could produce an abundance of crops