What is the Difference between a citizen and an American

QUOTE ON CITIZENS AND AMERICANS: Consider this quote from Guardian of Democracy: The Civic Mission of Schools: “America as a new nation was not created out of devotion to a motherland, a royal family, or a national religion. Americans are instead defined by our fidelity to certain ideals, expressed in the Declaration of Independence, Constitution, and Bill of Rights and subsequent amendments. While citizenship is formally acquired through either birth or naturalization, all of us must learn to become Americans. Peoples from diverse cultural, religious, and racial backgrounds can fully join the American community by sharing its defining commitments. If Americans are not bound together by common values, we will become fragmented and turn on one another.”

According to this quote, what is the difference between a citizen and an American?