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    • 26 July 1945

      • Together with the United Kingdom and China, the United States called for the unconditional surrender of Japan in the Potsdam Declaration on 26 July 1945—the alternative being "prompt and utter destruction".
      en.wikipedia.org › wiki › Surrender_of_Japan

      Surrender of Japan - Wikipedia

  2. www.history.com › topics › world-war-iiPearl Harbor: Attack, Deaths & Facts | HISTORY

    Oct 29, 2009 · Three days later, Japan’s allies Germany and Italy declared war against the United States. For the second time, Congress reciprocated, declaring war on the European powers.

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  4. en.wikipedia.org › wiki › Declaration_of_war_by_theDeclaration of war by the United States - Wikipedia

    United States President Franklin D. Roosevelt signs the declaration of war against Japan on December 8, 1941. A declaration of war is a formal declaration issued by a national government indicating that a state of war exists between that nation and another.

    War
    Declaration
    Opponent (s)
    Date Of Declaration
    War of 1812
    Declaration of war on the United Kingdom
    United Kingdom and its dependencies [11] ...
    June 18, 1812
    Mexican–American War
    Declaration of war on Mexico [14]
    Mexico
    May 13, 1846
    Spanish–American War
    Declaration of war on Spain
    Spain
    April 25, 1898
    World War I
    Declaration of war on Germany
    Germany
    April 6, 1917

    See full list on en.wikipedia.org

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  6. www.historyextra.com › period › second-world-warWhen and Why Did The USA Get Involved In WW2? | HistoryExtra

    Apr 15, 2024 · The United States of America officially declared its involvement in WW2 in December 1941, following Japan's attack on Pearl Harbor on 7 December.

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  7. www.britannica.com › event › Pearl-Harbor-attackPearl Harbor attack | Date, History, Map, Casualties ...

    1 day ago · Pearl Harbor attack, (December 7, 1941), surprise aerial attack on the U.S. naval base at Pearl Harbor on Oahu Island, Hawaii, by the Japanese that precipitated the entry of the United States into World War II. The strike climaxed a decade of worsening relations between the United States and Japan.

    • The Editors of Encyclopaedia Britannica
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  8. en.wikipedia.org › wiki › German_declaration_of_warGerman declaration of war against the United States - Wikipedia

    Closeup of Hitler as war is declared upon the United States, 11 December 1941. According to the terms of their agreements, Germany was obliged to come to the aid of Japan if a third country attacked Japan, but not if Japan attacked a third country.

  9. www.annefrank.org › en › timelineJapan bombs Pearl Harbor: Hitler declares war on the US

    In response, Hitler declared war on America on 11 December 1941, for Germany was an ally of Japan. This meant that Hitler had gained another strong opponent. From then on, the United States fought with the Allies against Nazi Germany.

  10. encyclopedia.ushmm.org › world-war-ii-key-datesWW2 Dates & Timeline | Holocaust Encyclopedia

    Nov 15, 2021 · December 8, 1941 The United States declares war on Japan, entering World War II. Japanese troops land in the Philippines, French Indochina (Vietnam, Laos, Cambodia), and British Singapore.