Step-by-step reasoning process: The current African nations of Angola, Guinea-Bissau and Mozambique participated in the the Portugese Colonial War. The Portugese Colonial War was a decisive struggle in Lusophone Africa. Lusaphone countries are those that include Portugese as an official language.
[Q and A]: Do all of the African regions that participated in the Portugese Colonial War share an official language?
yes

Step-by-step reasoning process: The comic character Popeye uses spinach as a source of power. A movie was made about Popeye. Popeye consumes spinach as a source of power in the movie.
[Q and A]: Has spinach been a source of power in a comic movie?
yes

Step-by-step reasoning process: Richard Wagner died in 1883. Televisions started to be developed in the 1920s.
[Q and A]:
Did Richard Wagner compose the theme songs for two television series?
no