---
id:"kb-2026-00322"
title:"World War II"
schema_type:"TechArticle"
category:"history"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method:"ai_assisted"
ai_models:["claude-opus"]
derived_from_human_seed:true
primary_sources:
  - title:"The Second World War (Antony Beevor)"
    type:"book"
    year:2012
    url:"https://www.antonybeevor.com/books/the-second-world-war/"
    institution:"Weidenfeld & Nicolson"
secondary_sources:
  - title: "MDN Web Docs — HTTP"
    type: "documentation"
    year: 2026
    url: "https://developer.mozilla.org/en-US/docs/Web/HTTP"
    institution: "Mozilla"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## TL;DR

World War II (1939-1945) was the deadliest conflict in human history, involving over 100 million people from 30+ countries. Axis (Germany, Italy, Japan) vs. Allies (US, UK, USSR, China, France). 70-85 million deaths. Ended with atomic bombings of Hiroshima/Nagasaki and the beginning of the Cold War.

## Core Explanation

Key events: 1939 Germany invades Poland, 1941 Pearl Harbor + Operation Barbarossa (Germany invades USSR), 1942 Battle of Midway + Stalingrad (turning points), 1944 D-Day (Normandy), 1945 VE Day + atomic bombs + VJ Day. Holocaust: systematic genocide of 6 million Jews. United Nations founded 1945. European powers declined; US and USSR emerged as superpowers.

## Further Reading

- [The Second World War (Antony Beevor)](https://www.antonybeevor.com/books/the-second-world-war/)