U.S. citizens travelling to Europe will need to apply for an ETIAS (European Travel Information and Authorization System), the new travel authorization for Europe that will come into effect in November 2023. ETIAS will help improve border management and boost security.

This means that, from November 2023, Americans travelling to a European country in the Schengen zone will be able to apply for ETIAS. The Schengen Area is composed of European Union countries like France, Italy, Germany, Sweden, and Spain, as well as 4 non-EU countries: Iceland, Lichtenstein, Norway, and Switzerland. ETIAS will permit visa-free travel to all Schengen countries for short stays during its validity.

https://www.etiasvisa.com/etias-requirements/americans