Citizenship Day (also known as Constitution Day) marks the anniversary of the ratification of the U.S. Constitution on September 17, 1787. It also recognizes all who, by coming of age or by naturalization, have become citizens.

The origin of this holiday dates back to 1940 when "I am an American Day" was celebrated on the third Sunday in May. In 1952, Congress moved the date to September 17 and renamed it “Citizenship Day.” In 2004, the official name changed to “Constitution Day and Citizenship Day.”

To celebrate this holiday, schools around the country receive federal funding to provide lessons about the Constitution. Take a moment today to reflect on the Constitution and what it means to be a U.S. citizen!