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Federalism is used to stop tyranny, or when one group has too much power. If one person has all the power, then the public's opinion isn't voiced and that one person alone can control the government, even if he is leading the nation to destruction. It doesn't always have to be one person, there can be tyranny of a group, of a religion, or even of a majority. This is where federalism comes in. Since there are multiple branches, even if one branch starts making bad decisions, the other branches can stop them.