Thanks for playing! It was my typo, I know there are 15 countries. I am not sure what do you mean with questions 11 and 12, Burma/Myanmar and Kampuchea/Cambodia are two different countries.
They're stating that your grammar was wrong. The way you phrased it means that the countries are currently called Kampuchea and Burma. You should say "Which Asian Country was known as ---- until 1989"
Question 20 is not about a historical name but rather a historical event. The nations were given away already so I don't think that question should count.
Question 8, Germany lost its overseas possessions in WWI and Namibia was no longer theirs. It was until British rule until independence.
Question 15, the full title is the Former Yugoslav Republic of Macedonia, and please capitalize the F in Former as it's an adjective in a title.
15 Countries were made after the dissolution of the Soviet Union, not 12.
The Questions 11 and 12 should say "Which Asian Country was known as Burma/Kampuchea until 1989".
Question 8, Germany lost its overseas possessions in WWI and Namibia was no longer theirs. It was until British rule until independence.
Question 15, the full title is the Former Yugoslav Republic of Macedonia, and please capitalize the F in Former as it's an adjective in a title.