The Plurinational State of Bolivia, so called for its many local peoples and spoken languages, is a landlocked country located in South America. It is bordered by Peru, Chile, Argentina, Paraguay, and Brazil, and is situated in the center of the continent. The country is named after the 19th century liberator Simon Bolivar, and Bolivia gained independence from Spain under his leadership on 6 August 1825. Bolivia has a population of just over 10 million, making it the world's 82nd largest country as of July 2014. The government of Bolivia operates under a republican system, and President Evo Morales was reelected to a second and final five-year term on 12 October 2014. The current Bolivian constitution, ratified 7 February 2009, defines the country as a Social Unitarian State.