from The National Pulse:

An analysis of the U.S. State Department‘s comprehensive list of global travel advisories reveals that the U.S. government believes a significant portion of the world, including much of Europe, is unsafe for Americans. The advisories categorize over 200 countries into four risk levels, which range from Level 1 (“Exercise Normal Precautions”) to Level 4 (“Do Not Travel”). Americans are to “exercise increased caution” in previously safe countries such as the United Kingdom, France, Germany, the Netherlands, and Spain.

Level 4 advisories caution against travel to countries deemed extremely hazardous for Americans due to terrorism, civil unrest, and crime. As of May 2024, the U.S. government advises against travel to the following countries: