<Ul> <Li> Canada </Li> <Li> Mexico </Li> <Li> United States </Li> </Ul> <Tr> <Th> Establishment </Th> <Td> January 1, 1994; 24 years ago (1994 - 01 - 01) </Td> </Tr> <Tr> <Th_colspan="2"> Area </Th> </Tr> <Tr> <Th> Total </Th> <Td> 21,578,137 km (8,331,365 sq mi) </Td> </Tr>

What does nafta do for the countries involved