I have been struggling to understand to differentiate the uses of an apostrophe in possession and noun-extended adjectives for possession. Sorry, I have confused them but try to get the idea of my problem.
1: Africa Cup of Nations, African Cup of Nations or Africa's Cup of Nations.
2: America Best Championships, American Best Championships or America's Championships
3:Africa Continent, African continent or Africa's continent
4:Nation Newspaper, National Newspaper or Nation's Newspaper
I will appreciate if I get clarifications on the problems with regards to the examples above