Final answer:
Nationalism, Militarism, and the alliance system were key causes of WWI, while Impressionism had no impact on the conflict.
Explanation:
Nationalism, intense pride in and devotion to one's country, was a major driving force behind World War I, fueling militarism and imperial ambitions.
Impressionism was NOT a major contributing cause to WWI. Impressionism was an art movement in the late 19th-century focusing on depicting a momentary impression rather than detailed realism.
The alliance system, Militarism, and Nationalism were crucial factors leading to the outbreak of World War I, while Impressionism had no direct impact on the causes of the war.
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