Great list and progress, I thought to do similar….
There is also a list here called ""The Travelers’ Century Club’s “Directory of Countries”" (see my profile) but it is very detailed and not alphabetically odered. It correctly splits a lot of Nations into detailed islands and regions for the very advanced traveller, the true explorer and adventurer! Do you mean “… Countries ANDREGIONS of the World” too?
If you want YOUR list to be definitive, specialy useful and succesful, name it either “Current 194 Political Nations of the Earth” or “The 191 Members of the United Nations”
You then don’t have to do with worries like Bouvet Island (=Norway) or French Antarctic Lands (=France) or Hong Kong (=China) neither current affairs and disputes ……
Anyway, to help;
Columbia > see Colombia
Bouvet Island (= Norwegian Protectorates)
Cape Verde (not Cape Verdi?) correct, a republic (try again)
Please continue, i’ll help…..