1) The Berlin Conference in 1884-1885 divided Africa among European powers and set the stage for the colonization of the continent.

2) The word "orange" contains three vowels: O, A, and E.

3) International relations encompass the study of relationships between nations, including diplomacy, treaties, and foreign policy. It examines the interactions and dynamics among different countries in the global arena.

4) The word "pizza" contains two vowels: I and A.