It was said to me that more people in the USA owned a copy of the Titanic DVD than a passport ... so seeing lots of "how many places have you visited" trawls on my social media feed with very small numbers suggested for the typical American does not surprise me.

Here in Europe (need to define "in", mind!) we have a lot of countries within a short distance and I speculate that most members here are more travelled (country wide) than yer typical Yank.  The list on the graphic, with 42 countries, is just a fraction; there are 193 members of the UN, plus a couple of others such as The Vatican,  which are countries in common understanding but not UN members.

P.S. - I count 21 I have visited (if counting living in the UK as visiting) plus places like Slovenia and Slovakia, Lithuania and Latvia, Norway and the USA, which are not seen as significant enough to have made this list