Brazil is the largest country in South America and the only one where Portuguese is the main language spoken. There are also African influences, due to the presence of slaves during the Portuguese colonisation. The vast majority of the population is Catholic, but freedom of religion is assured in the country’s constitution. The Amazon River contributes to Brazil having the largest biodiversity in the world. The most popular sport is football, and national team have won the World Cup five times – more than any other country. They will be hosting the next World Cup in 2014, and then the Olympics in 2016. Well known cities in Brazil include Brasilia, Sao Paulo and Rio de Janeiro.