Good compilation of countries with the highest numbers of gamblers. I am not surprised to see US leading the group though, they have the highest and largest casino in major cities. Even tourist travel to come have a fun time in their casinos. Nevertheless I was surprised no African country was mentioned there. I may not know in other African countries but you see in Nigeria we have lots of gamblers. No joke, the numbers are increasing every single day both in online casinos and in local betting shop.
Not surprised either that the US will top the list of countries that gambles the most, you cannot conclude about gambling popularity without mentioning a city like Las Vegas. I don't know much about other African countries but Nigerians are very huge on gambling, we have a large population of gamblers in the country, but it's mostly on sports bet. Physical casino are not too popular in the country I guess that could be the reason why the country is not among the top but online gambling is very popular here.