I think that i got the answer for number (30) and i think that the answer is (c) because it's George Washington and James Madison.
hope it help
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Here the barons demanded that King John sign a document called the Magna Carta guaranteeing them certain rights. By signing the document, King John agreed to do his duty as King of England, upholding the law and running a fair government. In return, the barons agreed to stand down and surrender London.
Federalism in the idea of the power being shared between the national and state level. checks and balances to keep the government from becoming tyrannical.