SCIENCE AND TECHNOLOGY Advances in weaponry, from improvements to the machine gun and airplane, to the invention of the tank, led to mass devastation during World War I.
ECONOMICS The war affected many European economies. Desperate for resources, the warring governments converted many industries to munitions factories. They also took greater control of the production of goods.
POWER AND AUTHORITY The quest among European nations for greater power played a role in causing World War I. By the turn of the 20th century,
relations among these countries had grown increasingly tense.