Canadians and Mexicans have special immigration privileges

Because of NAFTA (North American Free Trade Agreement) Canadians and Mexicans have special privileges that other immigrants don't have with respect to working in the United States without a visa, or visiting the United States in the case of Canadians who are particularly favored in the United States perhaps more than any other group of foreign nationals. Canadians do not need a visa or passport to enter the U.S. for visiting purposes. Canadians and Mexicans can work without visas in certain cases such as:

Canadians
1. Language translation jobs where the Canadian citizen is an interpreter (canada)
2. tour conductor where the tour originates in Canada and us mostly in Canada
3.consulting in public relations and advertising, (Canada or Mexico)
4. research and design for a company (canada or mexico)
5. supervisor of harvesting agricultural crops (owner only) (canada or mexico)
6.purchasing a company (located in Canada or Mexico)
7. servicing equipment or machinery for sale (Canada or Mexico)
8.transporting goods or passengers into the U.S. (Canada or Mexico)

This list is not exhaustive.