Hispanic Heritage Month By breanalanae Nov 17, 1968 Observation Started Hispanic Heritage Month Aug 17, 1988 Ronald Regan Hispanic Heritage MonthHispanic Heritage Week was changed to a month. Sep 15, 1989 Why the date was chosen. Hispanic Heritage Month The anniversary of independence for five Hispanic countries: Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. Nov 17, 2010 Cencus of Latinos Hispanic Heritage Month,A cencus which shows how Hispanics identify themsleves. Nov 19, 2014 Smithsonian Events Events.Events that celebrate.