Sparta technically had more territory on the map, but it was Athens that had the greatest geographic advantage, due mostly to the fact that its city states were positioned along the Mediterranean Sea.
In the 1800s there were more schools made by African Americans because of segregation
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. When Russia began to mobilize due to its alliance with Serbia, Germany declared war on Russia.
Most importantly, the Harlem Renaissance instilled in African Americans across the country a new spirit of self-determination and pride, a new social consciousness, and a new commitment to political activism, all of which would provide a foundation for the Civil Rights Movement of the 1950s and 1960s.