Canadian citizens do not need to obtain a visa in advance in order to apply for admission to the United States. A passport is not required to enter the U.S. except after a visit outside the Western Hemisphere. The only exceptions to the general visa waiver policy are for those individuals entering the U.S. as treaty traders or investors, as the fiance of a U.S. citizen or as immigrants. All travelers should be prepared to present documentary evidence of identity, citizenship, and (if applicable) resident status in Canada.