Americans simply don't need passports in the same way Europeans often do.
Not even, most of europe is in the EU and you don't need a passport to go to other EU countries, just an ID card(Hell some non-EU countires do accept EU ID cards in lieu of a passport if you're just visiting).
Not even, most of europe is in the EU and you don't need a passport to go to other EU countries, just an ID card(Hell some non-EU countires do accept EU ID cards in lieu of a passport if you're just visiting).