The Pearl Harbor attack took place on December 7, 1941.
Notes on verification
Multiple authoritative and independent sources, including U.S. Navy historical records, confirm this well-established date with no contradictions. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.925 clusters=2 claim_tier=everyday]
Sources
- Pearl Harbor attack | Date, History, Map, Casualties, Timeline, & Facts (seed:history_and_archaeology)
- https://www.history.com/articles/pearl-harbor (corroboration)
- https://www.history.navy.mil/browse-by-topic/wars-conflicts-and-operations/world-war-ii/1941/pearl-harbor.html (corroboration)
- https://cnrh.cnic.navy.mil/About/History/The-Attack-on-Pearl-Harbor/ (corroboration)