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The Moundbuilders carried out group labour projects under the rule of an elite. The largest site was Monk's Mound at Cahokia, Illinois, built from about AD 950 and reconstructed on a number of occasions over the following 300 years. The four-terraced mound, with a ramp leading to the first level, rises to 30 m/100 ft and covers an area of 5.6 ha/14 acres, making it the largest artificial mound in North America. The Moundbuilders were in decline by the time the Spanish arrived in the 17th century, but traces of their culture live on in the folklore of the Choctaw and Cherokee.
The Pillars of Hercules represent the promontories of Gibraltar and Ceuta. The shield represents the regions of Castile, Léon, Aragón, Navarre, and Granada. Effective date: 18 December 1981.
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