Citizenship Day commemorates the signing of the US Constitution on September 17, 1787 at the Constitutional Convention in Philadelphia. It is a day to honor and celebrate native born citizens and foreign-born Americans who became naturalized citizens during the past year. Observed on this date since 1952, citizenship was first celebrated as "I am an American Day" on the third Sunday in May.

Citizenship Day, sometimes called Constitution Day, is an important opportunity to remind ourselves and our communities about the rights and responsibilities of being citizens, to our nation and as global citizens in our global community. As citizens, it is our responsibility to become active participants in our democracy, and to make sure that everyone's civil rights are protected.