For all people's dont already know about bitcoin and they always say what's bitcoin and popular name for them to know this cryptocurrency even 80% americans heard about bitcoin they are late about it to learn for a late time for them also.
As a developed country with very easy and complete information, it is not unusual if 80% of Americans hear or know about bitcoin. But hearing about bitcoin doesn't mean getting involved in bitcoin trading or investing, because they have a tendency to "wait and see" before making a decision.