Answer:
William Jennings Bryan’s major contribution to the American political policy was that he was able to help in pushing or making it possible for the party politics to be back to the economic arena and in addition, it was not from the divisions of the sectionalism.
James Madison promised the Bill of Rights to the people even before the constitution was ratified. The Bill of Rights protects the basics freedoms of the people like freedom to practice any religion, the right to protest, the right to privacy. If you want a list of the first 10 amendments of the constitution I suggest you look them up.
John F. Kennedy
"Ask not what your country can do for you - ask what can you do for your country"