They talk to anyone and everyone.
And it’s not just the accents that give them away.
Americans are an outgoing bunch, openly conversing with strangers about anything and everything. Maybe it’s asking for directions, maybe it’s complimenting someone’s shoes, or maybe it’s just an innocent ‘hello.’ Whatever it is, friendly Americans do not shy at talking to strangers abroad—a characteristic that can immediately single one out.
This trait can be especially off-putting to some whose cultures are quite the opposite, like Germany. This very American attribute can often come off as suspicious and can potentially make locals a little uncomfortable.