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The Second World War: A Complete History

Written by the Fiveable Content Team โ€ข Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated August 2025

Definition

The Second World War: A Complete History is a comprehensive account of the global conflict that lasted from 1939 to 1945, involving most of the world's nations divided into two opposing military alliances: the Allies and the Axis. This war was marked by significant events such as the Holocaust, the use of nuclear weapons, and the establishment of the United Nations. The war reshaped international relations, altered national borders, and had profound impacts on societies around the globe.

5 Must Know Facts For Your Next Test

  1. World War II began on September 1, 1939, with Germany's invasion of Poland, prompting Britain and France to declare war on Germany.
  2. It was the deadliest conflict in human history, resulting in an estimated 70-85 million casualties worldwide.
  3. The war saw unprecedented technological advancements in warfare, including tanks, aircraft, and the first use of nuclear weapons in Hiroshima and Nagasaki.
  4. The establishment of the United Nations in 1945 aimed to promote international cooperation and prevent future conflicts after the war's devastation.
  5. The aftermath of World War II led to significant geopolitical changes, including the onset of the Cold War between the United States and the Soviet Union.

Review Questions

  • What were the main causes that led to the outbreak of World War II?
    • The main causes of World War II included unresolved issues from World War I, such as the harsh penalties imposed by the Treaty of Versailles on Germany. Economic instability during the Great Depression also contributed to social unrest and the rise of totalitarian regimes in Germany, Italy, and Japan. Additionally, aggressive expansionist policies by these countries prompted conflict as they sought to gain territory and resources.
  • Analyze how World War II impacted global politics and alliances in its aftermath.
    • World War II drastically changed global politics by shifting power dynamics and creating new alliances. The establishment of the United Nations aimed to foster international cooperation and prevent future wars. The emergence of two superpowersโ€”the United States and the Soviet Unionโ€”led to a bipolar world order and laid the groundwork for the Cold War. Countries in Europe underwent decolonization processes as former colonies sought independence from European powers weakened by the war.
  • Evaluate how technological advancements during World War II influenced post-war military strategies and civilian life.
    • Technological advancements during World War II, such as radar, jet aircraft, and atomic weaponry, significantly influenced both military strategies and civilian life after the war. The development of nuclear weapons introduced a new era of warfare characterized by deterrence strategies, where superpowers maintained peace through mutual threat. Civilian life was also affected as innovations like synthetic materials and computing technologies found applications beyond military use, paving the way for modern conveniences and advancements in various industries.

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