USCIS宣布持TN签证人士现可申请3年的身份有效期。而根据以往条例，TN申请人只有1
年的身份有效期。以下是USCIS对有关问题的Q & A.
Q: What is the TN nonimmigrant classification?
A: The TN nonimmigrant classification permits qualified Canadian and Mexican
citizens to seek temporary entry into the United States to engage in
business activities at a professional level. The TN classification was
created following Congressional approval of the North American Free Trade
Agreement (NAFTA) on December 8, 1993.
Q: What professional activities may a TN worker en
