Jackson Square, formerly the Place d'Armes or Plaza de Armas, is a historic park in the French Quarter of New Orleans, Louisiana. It was declared a National Historic Landmark in 1960, for its central role in the city's history, and as the site where in 1803 Louisiana was made United States territory pursuant to the Louisiana Purchase. In 2012 the American Planning Association designated Jackson Square as one of the Great Public Spaces in the United States.