Why does togo need french language?

Togo was one of the African countries that some time in the past were invaded and then dominated (in this case, as a part of "Golden Coast", in Western Africa) by French (first by Germans), until it could get independence (in 1960 only!!!); so folks there were obliged to learn how to speak French, otherwise they would be completely excluded (as some perhaps still are), so that that European way of speaking became its official language up to now, besides several African others, some mixed or having distinct dialects - none of these being official, only French!