What other main feature of MERCOSUR makes it quite unique among trade blocks, especially compared to NAFTA?
1) MERCOSUR has a standardized tariff system for external trade partners
2) MERCOSUR has its own judicial system which oversees all internal affairs
3) MERCOSUR has an integrated road and rail network between all member states that they built
4) MERCOSUR has a mission to incorporate all other states of the Americas into a single block
5) MERCOSUR has a single regional block airline