Qualified citizens of Canada and Mexico may temporarily enter the U.S. . under the TN classification to participate in commercial activities at professional level.
requirements
Eligibility for Canadian Citizens
Canadian citizens can apply as TN at a port of entry without a visa.
They must provide proof of citizenship, a letter from the employer, and an assessment of credentials.
Canadians
Eligibility for Mexican Citizens
Mexican citizens need a TN visa, which they must apply for at a U.S. embassy or consulate in Mexico.
Once the visa is approved, they can apply for admission to a U.S. port of entry.
Mexicans
Initial Admission and Family Period
Both Canadians and Mexicans are initially admitted for up to three years under the TN.
Family members (spouses and children under 21) may be eligible for TD status, but they cannot work in the U.S. and can study.