As Franck Verhaeghe and two friends planned a March trip to Mexico City, they plotted out not only where they would stay and which museums they would visit but also the language they would speak: French. “It’s not that I think it’s unsafe for Americans,” said Mr. Verhaeghe, 65, who lives in California, but “I can imagine people there aren’t very happy with us. So my friends and I decided that on this trip, we would all just speak French to each other.”

Two months into his second term, President Trump has set off panic in Europe about the potential collapse of alliances; inspired boycotts of American products in Canada; heightened tensions between Denmark and Greenland over the island’s independence; and prompted protests in Istanbul and Panama over the possibility of U.S. territorial expansion.

His proposals are also making some Americans reconsider their travel plans.

Behavior adjustments

Since the inauguration, some agencies are noticing a drop in sales for international travel by Americans. Tour operators are fielding inquiries from customers concerned about how they will be received abroad. The risk management company Global Rescue recently conducted a survey that found that 72 percent of “experienced” U.S. travelers expected Americans to be less welcome abroad this year.

The nervousness does not seem to have translated into widespread cancellations, but social media and travel forums are filled with Americans asking variations of “Will they hate us?”

Christine Bauer, a New Hampshire retiree who is planning a trip to France, asked travelers on a Rick Steves’ Europe forum for insight into how the French were responding to American foreign policy changes. A few days later, she grew more worried when “Trump and Musk began insulting NATO and allied countries.” She and her husband haven’t made any changes “at least for now,” but they are “hoping that travel doesn’t become more unsafe.”