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… 1816, an assembly of representatives from the provinces met in the Congress of Tucumán and declared the full independence of the United Provinces of South America (present-day Argentina, flag at right) from the Spanish Crown. Prior to this, Argentina had been part of the Spanish Viceroyalty of the Río de la Plata, whose limits also roughly contained the territories of present-day Bolivia, Paraguay, and Uruguay. It was ruled by a viceroy appointed by the Spanish Crown and guarded by the Spanish royal army. Part of the conflict between the settlers and the crown can be traced to the traditional, full prohibition of trading with all countries except Spain. After the Napoleonic invasion of Spain and the consequent imprisonment of Spain's king, a revolutionary wave broke out in the colony, leading to the declaration of independence on this day. Bolivia and Uruguay subsequently declared independence in 1825 and 1828, respectively. Argentine Independence Day is celebrated annually on July 9 to commemorate this event.
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(Prior July 9 posts are here and here.)