Canadians' return travel from trips to the U.S. has fallen sharply, 23% by car in February compared with the same month last year. Forecasts call for even sharper declines in air travel between Canada and the U.

A growing number of travelers say they are worried about feeling unwelcome or unsafe in America and are reluctant to support the economy of a country that may be destabilizing other nations.

After months of back-and-forth about whether he would hit products from Mexico and Canada with sweeping tariffs, President Donald Trump is vowing to go even bigger and impose duties affecting products from “all countries.