Buenos Aires is the capital and largest city in the South American country of Argentina. It has its own executive, legislative and judicial powers. It is in the central-eastern region of the country, on the southern shore of the Río de la Plata, in the Pampas region. The city was ceded in 1880 by the Province of Buenos Aires to be the federal capital of the country. It is the "main capital", along with 24 alternate capitals, because of the constitutional reform of 1994. Buenos Aires city is also known as Capital Federal to differentiate the city from the Buenos Aires Province. Until 1994 Buenos Aires city was under the presidential government, but after a constitutional reform in that year, the city became self-governed, allowing citizens to elect their city authorities.
