why does hispanic heritage month start on the 15th

Hispanic Heritage Month starts on September 15th because this date is the anniversary of independence for several Latin American countries: Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. The celebration was originally established as a week to include these important independence anniversaries, notably the Mexican War of Independence, which began on September 16th. When the commemoration was expanded to a full month, it was extended from September 15 to October 15 to also encompass the independence days of Mexico (September 16) and Chile (September 18), as well as Columbus Day or Día de la Raza on October 12. This timing allows for a 30-day period that honors the rich heritage, culture, and history of Hispanic and Latino Americans.