Yes it was acquired after WW1 and became part of the French Empire for awhile.
French Congo ended in 1910.
French Congo was created in 1880.
French Congo.
Le Congo (masc.)
Four countries were part of the French Equatorial Africa: Gabon, Central African Republic, Republic of the Congo, Chad.
République démocratique du Congo (Democratic Republic of the Congo; Congo-Kinshasa) République du Congo (Republic of Congo; Congo-Brazzaville)
French
It is important to note that French Congo is Congo-Brazzaville (Republic of Congo). Belgian Congo is Congo-Kinshasa (Democratic Republic of Congo), which is significantly larger. The French conquered Congo-Brazzaville in 1880 as a result of Pierre de Brazza's treaty with Makoko of the Bateke.
Belgium colonized Congo in order to get its raw materials. The Congo was also quite rich in minerals and fertile lands for cultivation.
Because Tunisia is a former French colony - Parce que la Tunisie est une ancienne colonie française.
Yes, the Congo Republic (capital: Brazzaville) and its neighbour the Congo Democratic Republic (capital: Kinshasa) are French speaking countries. They also have a lot of local languages.
Many countries are indeed French-speaking. Congo DRC, Congo, Gabon are just an example.