When is a star added to the flag after the admission of a new state?

A star is added to the flag on Independence Day following the admission of a new state to the Union. This practice emphasizes the celebratory nature of Independence Day, which is a significant national holiday in the United States that marks the country's declaration of independence. The addition of a new star symbolizes the growth and unity of the nation, reflecting the importance of statehood in the context of national identity.

The other options do not hold historical significance for the act of adding a star to the flag. New Year's Day, while a time of celebration, is not specifically linked to the addition of states. Memorial Day and Thanksgiving are also important holidays, but they do not relate to the process of updating the flag to reflect state admissions. Thus, the choice of Independence Day highlights both the patriotic spirit and the importance of recognizing new states at a moment that coincides with national pride.