Pearl Harbor refers to the surprise military attack carried out by the Imperial Japanese Navy Air Service against the United States naval base at Pearl Harbor, Hawaii, on the morning of 7 December 1941. The attack killed 2,403 Americans, wounded 1,178 others, destroyed or damaged numerous aircraft and naval vessels - including eight battleships - and prompted the United States to declare war on Japan the following day, formally entering World War II. The name “Pearl Harbor” is used both to denote the geographic harbor on the island of Oahu and, by extension, the attack itself and its broader historical significance.

Pearl Harbor was the principal base of the United States Pacific Fleet. By late 1941, diplomatic relations between the United States and Japan had deteriorated sharply over Japanese expansionism in East Asia and the Pacific, U.S. oil and trade embargoes imposed in response, and failed negotiations over Japanese withdrawal from China and Southeast Asia. Japanese military planners, led by Admiral Isoroku Yamamoto, devised the attack to neutralize American naval power in the Pacific long enough to allow Japan to consolidate territorial gains across the region.

The attack was launched in two waves beginning at approximately 7:48 a.m. local time on a Sunday morning. It targeted battleships, aircraft, and shore installations. The USS Arizona, USS Oklahoma, USS West Virginia, and USS California were among the most heavily damaged vessels. Five of the eight battleships struck were eventually repaired and returned to service. The three U.S. aircraft carriers assigned to the Pacific Fleet were at sea that day and escaped undamaged, a fact later regarded as strategically significant.

For detailed historical background, see pearl-harbor-history.

The broad military and diplomatic facts of the attack are well established. Scholarly debate continues over several interpretive questions, including the degree to which U.S. officials anticipated an attack at Pearl Harbor specifically, whether failures of intelligence analysis or command constituted negligence, and how the event should be situated within longer-arc histories of U.S.-Japan relations and American imperial involvement in the Pacific. The question of foreknowledge - whether any U.S. officials had advance warning sufficient to have prevented the attack - remains a subject of documented historiographical dispute. See pearl-harbor-foreknowledge-debate and pearl-harbor-controversy-advance-warning-controversy.

There is broad consensus among historians across multiple institutions that the attack was not anticipated by commanders at Pearl Harbor in actionable form on the day it occurred, and that the event precipitated direct U.S. entry into World War II. These foundational conclusions are reflected consistently in peer-reviewed scholarship, military history, and diplomatic history literature. See pearl-harbor-consensus-attack-surprise-consensus.

The attack as a strategic miscalculation by Japan. Many historians and strategists argue that, despite its tactical success, the attack was a strategic blunder that unified American public opinion and brought the full industrial and military capacity of the United States into the war against the Axis powers. See pearl-harbor-japanese-strategic-miscalculation-viewpoint.

The attack as an inevitable consequence of U.S. policy in the Pacific. Some historians emphasize that American economic sanctions, support for China, and insistence on Japanese withdrawal from its occupied territories made armed conflict likely, framing Pearl Harbor as a foreseeable, if not specifically anticipated, outcome of U.S. foreign policy choices. See pearl-harbor-us-policy-causation-viewpoint.

The Roosevelt administration had advance knowledge. A minority historiographical position, associated with revisionist historians, holds that senior officials in the Franklin D. Roosevelt administration had sufficient intelligence warning to have prevented the attack but withheld it from Pacific commanders, either through negligence or deliberate policy. See pearl-harbor-foreknowledge-revisionist-viewpoint and pearl-harbor-foreknowledge-revisionist-viewpoint-debate.

Pearl Harbor as a founding moment of American national identity. Scholars in cultural and memory studies have examined how the attack was constructed and reconstructed in American public memory, political rhetoric, and popular culture as a symbol of victimhood, resolve, and national unity - and how that memory has been mobilized in subsequent political contexts. See pearl-harbor-national-memory-viewpoint.

Advance warning and command responsibility. The Roberts Commission (1942) and subsequent official inquiries reached differing conclusions about the culpability of Admiral Husband Kimmel and General Walter Short, the commanders at Pearl Harbor; their posthumous reputations and the question of whether they were made scapegoats remain contested. See pearl-harbor-controversy-kimmel-short-responsibility-controversy.

Revisionist foreknowledge claims. A documented historiographical dispute exists over claims, advanced most prominently by John Toland and Robert Stinnett, that the Roosevelt administration had intercepted intelligence pointing specifically to the Pearl Harbor attack. Mainstream historians have disputed the evidentiary basis of these claims. See pearl-harbor-controversy-revisionist-foreknowledge-controversy.

• pearl-harbor-history - History
• pearl-harbor-foreknowledge-debate - Debate: Did U.S. officials have actionable foreknowledge?
• pearl-harbor-controversy-advance-warning-controversy - Controversy: Advance warning and command responsibility
• pearl-harbor-controversy-kimmel-short-responsibility-controversy - Controversy: Kimmel and Short command responsibility
• pearl-harbor-controversy-revisionist-foreknowledge-controversy - Controversy: Revisionist foreknowledge claims
• pearl-harbor-consensus-attack-surprise-consensus - Consensus: The attack as a tactical surprise
• pearl-harbor-foreknowledge-revisionist-viewpoint - Viewpoint: Revisionist foreknowledge claims
• pearl-harbor-foreknowledge-revisionist-viewpoint-debate - Viewpoint Debate: Revisionist vs. orthodox foreknowledge positions
• pearl-harbor-japanese-strategic-miscalculation-viewpoint - Viewpoint: Japanese strategic miscalculation
• pearl-harbor-us-policy-causation-viewpoint - Viewpoint: U.S. Pacific policy as causal factor
• pearl-harbor-national-memory-viewpoint - Viewpoint: Pearl Harbor in American national memory
• World War II - Main Topic: World War II
• united-states-entry-world-war-ii - Main Topic: U.S. entry into World War II
• us-japan-relations-1930s - Main Topic: U.S.-Japan relations in the 1930s

1. Gordon W. Prange, Donald M. Goldstein, and Katherine V. Dillon, *At Dawn We Slept: The Untold Story of Pearl Harbor* (New York: McGraw-Hill, 1981). 2. Roberta Wohlstetter, *Pearl Harbor: Warning and Decision* (Stanford: Stanford University Press, 1962). 3. John Toland, *Infamy: Pearl Harbor and Its Aftermath* (Garden City, NY: Doubleday, 1982). 4. Robert B. Stinnett, *Day of Deceit: The Truth About FDR and Pearl Harbor* (New York: Free Press, 2000). 5. Emily S. Rosenberg, *A Date Which Will Live: Pearl Harbor in American Memory* (Durham, NC: Duke University Press, 2003). 6. Akira Iriye, *The Origins of the Second World War in Asia and the Pacific* (London: Longman, 1987). 7. United States Congress, *Report of the Joint Committee on the Investigation of the Pearl Harbor Attack*, 79th Cong., 2nd sess. (Washington, DC: U.S. Government Printing Office, 1946).