The TN visa category is a product of the North American Free Trade Agreement
signed into law by President Clinton in 1992.  The following is a brief description of
the TN visa

An approved TN applicant may enter the U.S. for a maximum initial period of one
year.  Extensions of one year increments may be obtained,with no current limit to
the number of extensions.  

The procedures of obtaining the TN visa is significantly stream lined in comparison
to its H-1B counterpart.  Generally, Canadian professions may provide the required
documentation at a port of entry.  The required documentation includes the

Procedures for Mexican Citizens vary significantly and require the applicant to
apply for a nonimmigrant visa at a U.S Consulate.  
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TN Visas
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