What is the term for a change to the constitution?

amendment

power to the federal government compared to the state governments

Explanation:

By the end of the Convention, where did James Madison believed that the real division of interests was "power to the federal government compared to the state governments"

This is because James Madison as one of the main writers of Federalist papers argued throughout the constitutional convention that a strong Federal government is the most ideal for the United States as it will unite the states together and protect the right of the citizen.