Paraguay (Guarani: Paraguái), officially the Republic of Paraguay, is a landlocked country located in the central region of South America. It borders Bolivia to the northwest and north, Brazil to the northeast and east, and Argentina to the southeast, south, and west. Paraguay has access to the Atlantic Ocean via the Paraná–Paraguay Waterway. The country is governed as a unitary presidential republic composed of a capital district and seventeen departments. Its capital and largest city is Asunción.
The indigenous Guaraní had been living in eastern Paraguay for at least a millennium before the arrival of Spanish conquistadores in 1524. The city of Asunción was founded in 1537 as the first capital of the Governorate of the Río de la Plata within the Spanish Empire. During the 17th century, Paraguay was the center of Jesuit missions, where the natives were converted to Christianity and introduced to European culture. After the expulsion of the Jesuits from Spanish territories in 1767, Paraguay increasingly became a peripheral colony. Following independence from Spain in the early 19th century, Paraguay was ruled by a series of authoritarian governments. This period ended with the disastrous Paraguayan War (1864–1870), during which the country lost half its prewar population and around 25–33% of its territory. In the 20th century, Paraguay faced another major international conflict—the Chaco War (1932–1935) against Bolivia—in which Paraguay prevailed. It subsequently came under a succession of military dictators, culminating in the 35-year regime of Alfredo Stroessner, which lasted until his overthrow in 1989 by an internal military coup. This marked the beginning of Paraguay's current democratic era.