Why is the amendment process of the constitution an example of federalism?

The amendment process of the U.S. Constitution exemplifies federalism because it requires participation from both the national and state levels of government. To propose an amendment, either two-thirds of both houses of Congress or two-thirds of state legislatures must agree. Additionally, for an amendment to be ratified, three-fourths of the state legislatures or state conventions must approve it. This dual requirement reflects the balance of power between the federal and state governments inherent in the federalist system.