How did the founding fathers make sure that no person or group of people could contorl the government?

Our forefathers set up the Checks and Balances system. The three branches of government. The Legislative, Executive, and Judicial. Not one of them has more power than the other. It takes two of them to agree to overturn a decision. Even the President can not change a vote or an outcome of one of the other branches without approval of another branch.