september 17th is officially constitution day as well as what?

September 17th is officially recognized as both Constitution Day and Citizenship Day in the United States. Constitution Day commemorates the signing of the U.S. Constitution on September 17, 1787, while Citizenship Day honors all those who have become U.S. citizens, either by birth or naturalization. This dual observance has been officially designated since 2004, emphasizing the importance of the Constitution and citizenship responsibilities.