Permanent historical records ยท Updated 2026-11-03

1943 in United States of America

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.

240Unique records
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33Named events on this page
18Named people on this page
10Places on this page

January

Churchill and Roosevelt discuss next phase of war, a decision is made

Roosevelt, Theodore ยท Casablanca ยท President of USA ยท Warfare / United Nations

Churchill and Roosevelt discuss next phase of war, a decision is made to attack Sicily and Italy in bid to divert German military resources and make good pledge to Stalin for a second front in Europe

Conference of Casablanca

Roosevelt, Theodore ยท Casablanca ยท President of USA ยท Warfare / United Nations

Churchill and Roosevelt discuss next phase of war, a decision is made to attack Sicily and Italy in bid to divert German military resources and make good pledge to Stalin for a second front in Europe

Birth of Janis Joplin

Joplin, Janis ยท Texas ยท Arts / Popular Music

Birth of Janis Joplin

Alliance United States and Great Britain

Roosevelt, Franklin Delano ยท Warfare / World War, 2nd

Roosevelt & Churchill demand the unconditional surrender of Germany, Italy & Japan. 2nd meeting of US & UK leaders

Conference of Casablanca

Roosevelt, Franklin Delano ยท Casablanca ยท Warfare / World War, 2nd

Sicily will be invaded in July & in August. An Allied strategy is agreed to defeat Germany then Britain will fight against Japan. A joint Allied offensive will be launched on the Contentin Peninsula

Invasion of Sicily

Roosevelt, Franklin Delano ยท Sicily ยท Warfare / World War, 2nd

The Casablanca Conference agrees Sicily will be invaded in July & in August

Result of Surrender of Germany, Italy and Japan

Roosevelt, Franklin Delano ยท Washington ยท Warfare / World War, 2nd

The Allies adopt unconditional surrender as their declared objective for Germany, Italy and Japan.

Surrender of Germany, Italy and Japan

Roosevelt, Franklin Delano ยท Washington ยท Warfare / World War, 2nd

Roosevelt & Churchill demand the unconditional surrender of Germany, Italy & Japan

Bombing of Germany

Roosevelt, Franklin Delano ยท Washington ยท Warfare / World War, 2nd

The US airforce bombs Germany for the 1sr time

Invasion of Sicily

Eisenhower, Dwight David ยท Sicily ยท Warfare / World War, 2nd

Supreme Allied commander for the attack of Sicily & the Axis "underbelly" in Europe

Operation Husky

Eisenhower, Dwight David ยท Sicily ยท Warfare / World War, 2nd

Supreme Allied commander for the attack of Sicily & the Axis "underbelly" in Europe

Y-12 Completion Deadline

Groves, Leslie Richard ยท Oak Ridge ยท Warfare / Nuclear

Groves presses for the first Y-12 electromagnetic racetrack to be completed by July as detailed plant plans are reviewed.

February

Promotion to Four-Star General

Eisenhower, Dwight David ยท North Africa ยท General ยท Warfare / Military

Promoted to temporary full General while commanding Allied forces in North Africa.

March

Birth of Robert Bob Woodward

Woodward, Robert "Bob" ยท Media / Press

Birth of Robert "Bob" Woodward

Birth of Christopher Walken

Walken, Christopher ยท Arts / Cinema

Birth of Christopher Walken

April

Decatur Barrier Plant Construction

Keith, Percival C. ยท Decatur ยท Science / Technology

Construction begins on a plant in Decatur, Illinois, intended to manufacture gaseous-diffusion barrier material for K-25.

Oak Ridge Reservation Closed

Groves, Leslie Richard ยท Oak Ridge ยท Warfare / Nuclear

Fencing of the Oak Ridge reservation is completed and the secret production site is closed to normal public access.

Los Alamos Primer Lectures

Serber, Robert ยท Los Alamos ยท Science / Physics

Serber begins a series of introductory lectures explaining bomb physics and design to the newly arriving Los Alamos scientific staff.

University of California Los Alamos Contract

Oppenheimer, Robert ยท Los Alamos ยท Warfare / Nuclear

A contract is concluded with the University of California to manage Los Alamos administration, procurement and payroll.

Implosion Research Begins

Neddermeyer, Seth Henry ยท Los Alamos ยท Science / Physics

Neddermeyer begins experimental work on implosion as a method of rapidly compressing a hollow fissile assembly.

May

Birth of David Walker

Walker, David ยท Arts / Popular Music

Birth of David Walker

Conference of Trident

Roosevelt, Franklin Delano ยท Washington ยท President of USA ยท Warfare / World War, 2nd

Roosevelt opens strategic discussions with Churchill at the Trident Conference in Washington

Birth of Mary Wells

Wells, Mary ยท Arts / Popular Music

Birth of Mary Wells

Operation Roundup

Roosevelt, Franklin Delano ยท Washington ยท President of USA ยท Warfare / World War, 2nd

The Trident Conference confirms planning for a cross Channel invasion while continuing Mediterranean operations

International Agreement at Washington

Roosevelt, Theodore ยท Washington ยท President of USA ยท Warfare / World War, 2nd

Churchill & Roosevelt meet in Washington where they agree a cross-Channel invasion (Operation Overlord) to be provisionally be launched on 1 May 1944

Operation Overlord

Roosevelt, Theodore ยท Washington ยท President of USA ยท Warfare / World War, 2nd

Churchill & Roosevelt meet in Washington where they agree a cross-Channel invasion (Operation Overlord) to be provisionally be launched on 1 May 1944

K-25 Surveying Begins

Keith, Percival C. ยท Oak Ridge ยท Science / Technology

Surveying begins for the massive K-25 gaseous-diffusion uranium-enrichment plant at Oak Ridge.

June

Current Tax Payment Act

Morgenthau, Henry ยท Washington ยท Treasury Secretary ยท Economy / Taxation

The Act establishes payroll withholding for federal income-tax payments.

Capture of Pantelleria

Eisenhower, Dwight David ยท Pantelleria ยท Warfare / World War, 2nd

Eisenhowers forces capture the Italian island of Pantelleria

Naturalization

Kissinger, Henry Alfred ยท Politics / Republican Party

Becomes a naturalized US citizen

Los Alamos Ordnance Division

Parsons, William Sterling ยท Los Alamos ยท Warfare / Nuclear

Navy Captain William Parsons arrives at Los Alamos to lead the Ordnance Division and direct gun-assembly development.

July

Bombing of Sicily

Eisenhower, Dwight David ยท Sicily ยท Warfare / World War, 2nd

The Allies begin bombing the airfields of Siciliy as a prelude to invasion

Invasion of Italy

Eisenhower, Dwight David ยท Sicily ยท Warfare / World War, 2nd

The Allies begin bombing the airfields of Siciliy as a prelude to invasion

Invasion of Sicily

Eisenhower, Dwight David ยท Sicily ยท Warfare / World War, 2nd

The Allies begin bombing the airfields of Siciliy as a prelude to invasion

First Implosion Explosion

Neddermeyer, Seth Henry ยท Los Alamos ยท Science / Physics

Neddermeyer conducts the first explosive experiment in the Los Alamos implosion research programme.

Invasion of Sicily

Eisenhower, Dwight David ยท Sicily ยท Warfare / World War, 2nd

The Allied invasion of Sicily begins

First Los Alamos Nuclear Physics Experiment

Oppenheimer, Robert ยท Los Alamos ยท Science / Physics

Los Alamos begins its first nuclear-physics experiment, measuring plutonium-239 fission-neutron yield and marking the laboratory's transition into active experimental work.

Invasion of Italy

Roosevelt, Theodore ยท Salerno ยท President of USA ยท Warfare / World War, 2nd

Allied forces land on the Italian mainland at Salerno, almost 400 landing craft and supply ships involved in landings

Invasion of Sicily

Clark, Matt ยท Sicily ยท Warfare / World War, 2nd

Commands the 5th Army during the Allied invasion of Sicily

Invasion of Sicily

Patton, George Smith ยท Sicily ยท Warfare / World War, 2nd

Lands ashore at the head of the 7th Army

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.