A role played by James Madison in U.S.'s democracy was B. He wrote the Bill of Rights, which placed limits on the federal government's power.
How did James Madison influence U.S. democracy?
James Madison contributed a lot to the writing of the Bill of Rights which would ensure that the people's rights were protected.
This contributed to democracy because it made sure that the government had to operate by the will of the people and not the other way around.
Find out more on the Bill of Rights at https://brainly.com/question/706108.
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