Explain how imperialism, militarism, nationalism, and the alliance system played a role in the beginning of the war.

Nationalism, imperialism and militarism had major roles in the war. Nationalism, for example, can allow countries to unite, and become strong. ... To get these countries at high demand, powerful armies were needed, eventually leading to militarism, glorifying military power and have a standing army at all times.

Explanation:

c. troops marched forward in close formation against newer, more accurate weapons