On September 15, 1820, an uprising occured in Lisbon, Portugal, following similar insurrection in Porto the previous month. This was no bloodthirsty mob, but, instead, a popular demand for constitutional government. Unfortunately, the country was beset with imperial and monarchical problems for some time to come.
The United Nations established September 15 as International Day of Democracy, in 2007. An Independence Day is celebrated on this date in Guatemala (a Patriotic Day), El Salvador, Honduras, Nicaragua, and Costa Rica, commemorating independence from Spain in 1821.