The Capital of Brazil is...

Brasília!!!!

People often say that Sao Paulo is the capital of Brazil or that Rio de Janeiro is the capital of Brazil. They belong to a list of the most important cities in Brazil, but they are not the Capital, Brasília is the one. 

If you say that, it is not too bad! 

Please, never ask (or say) to a Brazilian if the capital of Brazil is Buenos Aires. That's too much!!! Buenos Aires is the capital of Argentina, another country located in South America. 

And do you want to know why not to do that? Argentina is the major rival of the Brazilian Soccer Team. That's why!!