---
id: kb-2026-00322
title: World War II
schema_type: TechArticle
category: history
language: en
confidence: medium
last_verified: "2026-05-28"
created_date: "2026-05-22"
generation_method: ai_structured
ai_models:
  - claude-opus
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-world-war-ii-1
    statement: World War II began in Europe after Germany invaded Poland in September 1939.
    source_title: World War II
    source_url: https://www.britannica.com/event/World-War-II
    confidence: medium
  - id: fact-world-war-ii-2
    statement: >-
      The Japanese attack on Pearl Harbor on December 7, 1941, brought the United States into World
      War II.
    source_title: Pearl Harbor Attack
    source_url: https://www.nationalww2museum.org/war/articles/pearl-harbor-attack
    confidence: medium
  - id: fact-world-war-ii-3
    statement: Germany signed an unconditional surrender at Reims on May 7, 1945.
    source_title: Surrender of Germany
    source_url: https://www.archives.gov/milestone-documents/surrender-of-germany
    confidence: medium
completeness: 0.88
known_gaps:
  - This compact repair keeps only source-mapped public claims from the sampled audit entry.
disputed_statements: []
primary_sources:
  - title: World War II
    type: encyclopedia
    year: 2025
    url: https://www.britannica.com/event/World-War-II
    institution: Encyclopaedia Britannica
  - title: Pearl Harbor Attack
    type: blog_post
    year: 2025
    url: https://www.nationalww2museum.org/war/articles/pearl-harbor-attack
    institution: The National WWII Museum
  - title: Surrender of Germany
    type: government_report
    year: 2025
    url: https://www.archives.gov/milestone-documents/surrender-of-germany
    institution: U.S. National Archives
secondary_sources: []
updated: "2026-05-28"
---

## TL;DR

World War II was a global war shaped by Germany invasion, Pearl Harbor, and the Allied defeat of Axis powers. This repair binds each claim to institutional history sources.

## Core Explanation

The previous entry had weak coverage. The repaired version focuses on three stable chronology facts with direct evidence.

## Further Reading

- [World War II](https://www.britannica.com/event/World-War-II)
- [Pearl Harbor Attack](https://www.nationalww2museum.org/war/articles/pearl-harbor-attack)
- [Surrender of Germany](https://www.archives.gov/milestone-documents/surrender-of-germany)