A growing number of America's closest allies are updating their travel advisories for citizens visiting the United States, citing stricter immigration enforcement and the potential for detention or deportation—even for travelers carrying valid visas or authorization.
In mid-March, Germany, the United Kingdom, Finland and Denmark all revised their official guidance, warning that entry into the U.S. is not guaranteed and that travelers may face increased scrutiny at the border. While such warnings are not uncommon, the fact that four allied nations updated their U.S. travel advisories within days of each other has raised questions about changing international perceptions of the U.S. and what risks travelers should now consider.
"You may be liable to arrest or detention if you break the rules."
These warnings don't prohibit travel—but they highlight that entry into the U.S. is increasingly viewed as uncertain, even for tourists from long-standing allied nations.
The new advisories follow several incidents involving foreign nationals being detained or deported at US airports, despite carrying valid documentation.
In one case, a German citizen with a valid green card was reportedly held at Boston Logan International Airport and placed in a detention facility. Other cases reportedly involve entry complications tied to gender markers on documents or inconsistencies in travel plans.
For travelers, the guidance is clear: bring documentation, be prepared for detailed questioning, and understand that authorization to travel is not the same as authorization to enter.
For the US, the coordinated nature of these warnings may be a diplomatic signal: allies are watching how the US treats their citizens—and they're no longer assuming it will go smoothly.