Which event is commemorated on Flag Day in the United States?

Flag Day in the United States commemorates the adoption of the United States flag. This date, celebrated on June 14th, marks the anniversary of the Continental Congress's adoption of the flag in 1777. The significance of this event lies in its representation of the unity and identity of the nation as the flag symbolizes American values and history. While other choices reference important historical events, they do not pertain specifically to the flag's adoption. The understanding of this observance emphasizes the importance of national symbols and the pride associated with them in American culture.