In starting June, American tourists will need passport for land, sea and air to back into the US. They no longer show driver's license card to US entry. You may apply for passport. Cost $100 but new Passport Card is good only for land and sea crossings between US, Canada, Mexico, Bermuda and the Caribbean, it is $45 for adults and $35 for kids under 15.
Travelers need a passport June 1 for entry into Canada -