why does hispanic month start on the 15th

Hispanic Heritage Month starts on September 15 because this date marks the anniversary of independence for several Latin American countries: Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. Additionally, Mexico and Chile celebrate their independence on September 16 and September 18 respectively. The month-long celebration from September 15 to October 15 was originally Hispanic Heritage Week but was expanded to cover these significant dates that highlight the contributions and history of Hispanic cultures in the United States.