Invention of Atomic Bomb
Roosevelt decides to test Einsteins theory & develop the atomic bomb
Permanent historical records · Updated 2026-11-03
1943 in United States of America — Page 6
Explore 240 historical events and records for United States of America in 1943.
Historical records for United States of America in 1943
Sorted by month and day. Records with no month are shown last. Showing 40 of 240 unique records.
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Other events (month unknown)
Invention of Atomic Bomb
Roosevelt decides to test Einsteins theory & develop the atomic bomb
K-25 Plant
Gaseous diffusion plant development advances uranium enrichment.
Landing Craft Limits Affect Strategy
Planners considered how shortages of amphibious equipment constrained possible operations.
Leaders Discuss Soviet Aid
The Allied participants reviewed the importance of material support for the Soviet war effort.
Lieutenant
Appointed Lieutenant General
Lieutenant General
Appointed Lieutenant General
Manhattan Project
Appointed head of the Manhattan Project by Roosevelt to develop the atomic bomb
Manhattan Project
Appointed head of the Manhattan Project by Roosevelt to develop the atomic bomb
Marriage
Oron Welles marries Rita Hayworth
Marriage
Oron Welles marries Rita Hayworth
Marshall Argues For French Landing
American general George Marshall supported an early invasion of France during Casablanca planning discussions.
Mediterranean Strategy Enters Debate
British and American delegations debated how Mediterranean operations could advance their common war effort.
Microwave Early Warning
Develops microwave radar systems for wartime detection and control.
Moscow Declaration Calls For Organization
The four power Moscow Declaration called for a general international organization based on sovereign equality.
North African Offensive Gets Attention
The Allied chiefs considered how to complete the campaign against Axis forces in North Africa.
Oak Ridge
Oversees uranium-enrichment work at Oak Ridge.
Operation Bolero
A million Americans are shipped to Britain for the Allied invasion of Europe
Operation Roundup
The invasion of France is called off because of the cost of Operation Torch in Africa
Operation Torch
Roosevelt agrees to the British request to invade North Africa, Operation Torch
Opposes Churchills efforts to divide Europe into spheres of influence
Opposes Churchills efforts to divide Europe into spheres of influence
Pacific Theater Receives Attention
Allied commanders discussed military priorities in the Pacific while addressing the war against Germany.
Persuades Churchill of the wisdom of a meeting between Roosevelt & Stalin
Persuades Churchill of the wisdom of a meeting between Roosevelt & Stalin
Promotion to Second Lieutenant
The Army promoted Shaw to second lieutenant in 1943 after his wartime enlistment.
Roosevelt Meets Churchill At Anfa
Roosevelt met Churchill at the Anfa Hotel to review Allied plans for defeating the Axis powers.
Roosevelt Meets Henri Giraud
Roosevelt met French general Henri Giraud during the Casablanca gathering.
Second Front Pressures Are Considered
Roosevelt and Churchill considered Soviet requests for a second European front while planning Allied operations.
Shipping Allocation Becomes Central
British and American chiefs negotiated the distribution of scarce transport and landing craft.
Sicily Decision Leads To Husky
The operational choice made at Casablanca provided the strategic basis for Operation Husky later that year.
Sicily Planning Sets Allied Priorities
The conference gave Mediterranean operations a leading place in the Allied strategy for 1943.
Solomon Islands Operations Are Considered
The military delegations discussed the Pacific campaign in the Solomon Islands.
Supreme Allied Commander
Appointed Supreme Allied Commander for western Europe. Appointed Supreme Allied Commander for the western Mediterranean. Appointed Supreme Allied Commander for North Africa
Supreme Allied Commander
Appointed Supreme Allied Commander in western Europe. Appointed Supreme Allied Commander in the western Mediterranean. Appointed Supreme Allied Commander for North Africa
Thin Man
Development efforts were directed to a plutonium gun-type fission weapon called "Thin Man"
Third Army
Appointed Commanding General 3rd Army
U Boat Threat Shapes Planning
Military leaders evaluated the danger posed by German submarines to Allied supply routes.
Unconditional Surrender Policy Announced
Roosevelt publicly announced that the Allies sought unconditional surrender of the Axis powers.
Under Secretary
Appointed Under Secretary of State
We Refugees
Arendt published We Refugees, a powerful reflection on displacement and identity.
Y-12 Plant
Calutrons at Y-12 enrich uranium by electromagnetic separation.
How these records were prepared
Generated from the World History Database historical_events table. Identical display records are collapsed; descriptions otherwise retain the stored text. Coverage and source quality vary. Check primary and specialist sources before citing individual historical claims.