mercosul, also known as the Southern Common Market, is a trading bloc and customs union consisting of the countries of argentina, bolivia, paraguay, uruguay, venezuela with associate members Bolivia, Chile, Colombia, Ecuador, and Peru.

to enter brazil, no passport is required from citizens of the six mercosulcountries- in fact, there is a particular ease of access traveling within and among these neighboring nations, as part of the free trade agreement that supports and promotes the easy movement of people, goods, and currency among these regions collectively grouped in the mercosul. 

With the phenomenal growth that the country has experienced over the last few years and the recent FIFA World Cup and upcoming 2016 Olympics in Rio de Janeiro, the country has seen a large influx of nationals from its neighboring countries.