Each year, from September 15 to October 15, Americans observe National Hispanic Heritage Month by celebrating the histories, cultures, and contributions of American citizens whose ancestors came from Spain, Mexico, the Caribbean, and Central and South America.
The observation started in 1968 as Hispanic Heritage Week under President Lyndon Johnson and was expanded by President Ronald Reagan in 1988 to cover the 30-day period. Public Law 100-402 was enacted on August 17, 1988.
The day of September 15 is significant because it is the anniversary of independence for the Latin American countries of Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. Mexico and Chile celebrate their independence days on September 16 and September 18, respectively. Also, Columbus Day or Día de la Raza, which is October 12, falls within this 30 day period. (Source: The Library of Congress, About National Hisplanic Heritage Month)