What example of militarism told europeans that the region was on the edge of war?

The correct answer is Germany stockpiled an enormous number of modern weapons

Although Germany was forbidden from making weapons after world war 1, they eventually started making it and modernizing their military. This was a warning for others because a country doesn't prepare for war unless it actually plans to fight in one so it raised a red flag and showed everyone that they also needed to develop their military more.

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.