Apparently the USA is behind Norway, Finland, and Switzerland in mass shooting deaths per 100k population [1]. For typical gun related homocides it is most certainly correlated with poverty and education.
In USA, the measure "number of mass shootings per year" doesn't have real outliers, it has a reasonable number every year. In Norway, it's different, you get a streak of zeroes, followed by a 1.
The comparison is bogus, because you can make the numbers arbitrarily high by subdividing into tiny areas and then conveniently ignoring all the places where they are zero.
Why not subdivide further and claim that Buskerud is a veritable warzone, compared to the whole of USA on average?
Sure, but that doesn't solve the original problem which is that you picked small population countries with number of shootings too low to do meaningful statistical analysis your way because any rare event will have an outsized effect.
There are however plenty of European countries with populations large enough to avoid this problem (Germany, France, Italy, UK...).
Which year is this for? The Finland numbers don't seem right at all.
Neither do the Norway ones.
The numbers are in fact so wrong that one has to seriously question the motivations of the author, it seems like this is a propaganda piece with made up numbers designed to make the US appear slightly less terrible.
The number from Norway is from a single mass shooting in 2011 where a man shot children trapped on an island. There have never been anything like that before or later. He killed more people than the total number of murder victims in an average year.
[1]: https://lh4.googleusercontent.com/sTbiw2S8fHl89qyY6AXbohcKkv...