Argentina is the second largest country in both South America and the Latin America region. The country is a federation of 23 provinces and the autonomous city of Buenos Aires, its capital and largest city. It is the eighth-largest country in the world by land area and the largest among Spanish-speaking nations by geographical area of 2,780,400 km2 and is the fourth by population, with over 41 million people. Argentina is a founding member of the United Nations, Mercosur, the Union of South American Nations, the Organization of Ibero-American States, among others. Argentina is located in South America, bordered by Chile to the west and south, Bolivia and Paraguay to the north and Brazil and Uruguay to the northeast. The country faced several military coups and political instability during the 20th century, along with periodic economic crisis that continue to this day. However, Argentina is Latin America’s third-largest economy. Within Latin America, Argentina has the fifth highest nominal GDP per capita and the second highest in purchasing power terms. Argentina is the Latin American country with the most Nobel Prizes, for a total of five, all obtained during the second half of the twentieth century. The country has three Nobel prizes in science and two of peace.