Canadians crossing the northern border into the US for over 30 days will now need to fill out a new form, though not a visa, under a recent rule change. Previously, Canadians did not need any form or visa for casual travel, tourism, or shopping in the US. The updated requirement does not involve registering with the federal government upon entry. It is important for Canadian travelers to be aware of this change to ensure a smooth entry process into the United States.