Britain has never invaded the Marshall Islands, to my knowledge - maybe you know more than me: when was that invasion? I question your Estonian claim as well - Britain actually helped establish the state of Estonia through its involvement there in the Russian Civil War. Croatia, another ally, is a similar story (it was under Italian control in WW2). The brief raid in what is now Costa Rica is pretty tenuous and hardly constitutes an invasion - that can probably be kept in, but a caveat with an explanation of what you mean by "invasion" would be good.
As for Japan, do you mean the UK defending against Japanese invasions in World War 2? We have never invaded Japan, eh.
Thanks for your reply! One of the sources I used was this one: https://www.statista.com/chart/3441/countries-never-invaded-by-britain/. There are multiple other websites with the same data.
Do you think it is best to change some anwsers in the quiz? I can swap out the debatable ones.
I'd remove Japan and the Marshall Islands; with the other two, it would be better to remove them but if you need items to keep in, you could re-word the description of the quiz.
As for Japan, do you mean the UK defending against Japanese invasions in World War 2? We have never invaded Japan, eh.
Haven't looked up the others.
Do you think it is best to change some anwsers in the quiz? I can swap out the debatable ones.