Surprised about some of the ones in Africa, and the handful I missed are all African countries. That's interesting. Also, I'm guessing 9% missed the USA because you don't accept "US" or "USA" and it's required to type in "United States." The UK would probably be higher on the list of results as well but for the same reason.
For some reason I thought I went to a WalMart in South Korea before a couple times while I was living there. I'm not 100% certain anymore... but I'm pretty sure there was one in Seoul. Maybe it was a Price Club.
They have tried to make inroads in to some Asian and European countries but met with strong resistance from local copycat retailer superstore chains there. Carrefour, Danube Hypermarket, Hyper Panda, SM, Robinson's, etc.