The declaration marked the formal entry of the United States into the war against Japan and initiated full-scale American mobilization for World War II.
References / Sources
No source references have been added for this event yet.
Related Timeline Entries
September 21, 2026
•
Donald Trump
Legislation
Trump Signs Russia Sanction Bill into Law
Trump officially signs a sanctions bill that expands tariff powers against Russia.
September 20, 2026
•
Donald Trump
Legislation
Trump Signs Sanctions Bill Allowing Steep Tariffs on India
Trump signs a sanctions bill that empowers him to impose significant tariffs on India.
September 19, 2026
•
Donald Trump
Legislation
Trump Signs Russia Sanctions Bill, Expanding Tariff Powers
Trump signed a sanctions bill against Russia, enhancing his tariff authority.
September 18, 2026
•
Donald Trump
Legislation
Trump Signs Russia Sanctions Bill into Law
Trump officially signs a sanctions bill against Russia, expanding his tariff powers.