Declaration of war on Japan

E187648

United States congressional declaration of war joint resolution

The Declaration of war on Japan was the formal U.S. congressional resolution passed on December 8, 1941, that brought the United States into World War II following Japan’s attack on Pearl Harbor.

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All labels observed (3)

Label	Occurrences
United States entry into World War II	4
Declaration of war on Japan canonical	1
United States declarations of war during World War II	1

How this entity was disambiguated

This entity first appeared as the object of triple T1659217 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Declaration of war on Japan
Context triple: [United States Armed Forces in World War II, legalFramework, Declaration of war on Japan]

A. attack on Pearl Harbor
The attack on Pearl Harbor was the surprise Japanese military strike on the U.S. naval base in Hawaii on December 7, 1941, that led to the United States’ entry into World War II.
B. Operation Ichi-Go
Operation Ichi-Go was a major 1944 Japanese military offensive in China during World War II aimed at securing railways, destroying U.S. air bases, and linking Japanese-held territories.
C. The Fall of Japan
The Fall of Japan is a historical nonfiction book by William Craig that chronicles the final months of World War II and the events leading to Japan’s surrender.
D. V-J Day
V-J Day marks the Allied victory over Japan in World War II and the effective end of the war following Japan’s surrender in August 1945.
E. Allied strategic bombing of Japan
Allied strategic bombing of Japan was the World War II air campaign in which U.S. and Allied forces conducted extensive conventional and atomic bombing raids against Japanese cities and industrial targets to cripple Japan’s war-making capacity and force its surrender.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Declaration of war on Japan
Target entity description: The Declaration of war on Japan was the formal U.S. congressional resolution passed on December 8, 1941, that brought the United States into World War II following Japan’s attack on Pearl Harbor.

A. attack on Pearl Harbor
The attack on Pearl Harbor was the surprise Japanese military strike on the U.S. naval base in Hawaii on December 7, 1941, that led to the United States’ entry into World War II.
B. Operation Ichi-Go
Operation Ichi-Go was a major 1944 Japanese military offensive in China during World War II aimed at securing railways, destroying U.S. air bases, and linking Japanese-held territories.
C. The Fall of Japan
The Fall of Japan is a historical nonfiction book by William Craig that chronicles the final months of World War II and the events leading to Japan’s surrender.
D. V-J Day
V-J Day marks the Allied victory over Japan in World War II and the effective end of the war following Japan’s surrender in August 1945.
E. Allied strategic bombing of Japan
Allied strategic bombing of Japan was the World War II air campaign in which U.S. and Allied forces conducted extensive conventional and atomic bombing raids against Japanese cities and industrial targets to cripple Japan’s war-making capacity and force its surrender.
F. None of above. chosen

Statements (45)

Predicate	Object
instanceOf	United States congressional declaration of war ⓘ joint resolution ⓘ
category	1941 in international relations ⓘ Declarations of war ⓘ United States home front during World War II ⓘ United States–Japan relations ⓘ linked to: Japan–United States relations
cause	Attack on Pearl Harbor ⓘ linked to: attack on Pearl Harbor Japanese attacks on U.S. and British territories in the Pacific ⓘ
chamber	United States House of Representatives ⓘ United States Senate ⓘ
conflict	World War II ⓘ
country	United States ⓘ linked to: United States of America
date	1941-12-08 ⓘ
dateOfPresidentialSignature	1941-12-08 ⓘ
effectiveDate	1941-12-08 ⓘ
followedBy	United States declaration of war on Germany ⓘ United States declaration of war on Italy ⓘ
hasJurisdiction	federal government of the United States ⓘ linked to: United States government
introducedBy	Franklin D. Roosevelt ⓘ linked to: President Franklin D. Roosevelt
language	English ⓘ
legalForm	public law ⓘ
legislativeBody	United States Congress ⓘ
location	Washington, D.C. ⓘ
officeHeldBySignatory	President of the United States ⓘ
onlyDissentingVoteInHouse	Jeannette Rankin ⓘ
opponentCountry	Empire of Japan ⓘ linked to: Imperial Japan
partOf	United States declarations of war during World War II ⓘ linked to: Declaration of war on Japan
precededBy	Attack on Pearl Harbor ⓘ linked to: attack on Pearl Harbor Infamy Speech ⓘ
relatedEvent	Japanese attack on Guam ⓘ linked to: Battle of Guam (1941) Japanese attack on Malaya ⓘ Japanese attack on Wake Island ⓘ linked to: Battle of Wake Island Japanese invasion of the Philippines ⓘ linked to: Philippines campaign (1941–1942)
relatedSpeech	Infamy Speech ⓘ
result	Entry of the United States into World War II ⓘ State of war between the United States and Japan ⓘ
signatory	Franklin D. Roosevelt ⓘ linked to: President Franklin D. Roosevelt
subjectOf	United States congressional records ⓘ linked to: Congressional Record historical analyses of U.S. entry into World War II ⓘ
temporalContext	1941 in the United States ⓘ Pacific War ⓘ
voteResultInHouse	388–1 ⓘ
voteResultInSenate	82–0 ⓘ
warDeclaredOn	Empire of Japan ⓘ linked to: Imperial Japan
warPowersExercised	constitutional power of Congress to declare war ⓘ

How these facts were elicited