Sorry... (<- another proof of my Canadian citizenship) didn't mean to stir up the debate.
I'm not advising people to travel without passports between Canada and the United States -- they can make their own choices. The freedom and convenience are preferable though, e.g. those enjoyed by EU/EEA/Swiss citizens who may travel freely in the region with credit card-sized national ID cards, or Hong Kong and Macau permanent residents with Chinese citizenship who may travel to and from China with two credit card-sized cards.
Last edited by jplus; Jan 10, 2017 at 5:25 am