Albert Einstein writes President Franklin D. Roosevelt, alerting the President to the importance of research on nuclear chain reactions and the possibility that research might lead to developing powerful bombs. Einstein notes that Germany has stopped the sale of uranium and German physicists are engaged in uranium research.
Roosevelt establishes the Office of Petroleum Coordinator for National Defense
May 28, 1941
Roosevelt establishes the Office of Petroleum Coordinator for National Defense, later the Petroleum Administration for War, to issue rules governing the production, transportation, and distribution of petroleum and petroleum products.
Pearl Harbor Attack
December 7, 1941
The Japanese attack Pearl Harbor. The United States enters the war.
Production of atomic bomb by Rosevelt
January 19, 1942
President Roosevelt approves production of the atomic bomb following receipt of a National Academy of Sciences report determining that a bomb is feasible.
Army takes responsibility for construction of atomic weapons
June 17, 1942
President Roosevelt instructs the Army to take responsibility for construction of atomic weapons complex. The Army delegates the task to the Corps of Engineers.
Manhattan Engineer District develop atomic weapons
August 13, 1942
The Army Corps of Engineers establishes the Manhattan Engineer District to develop and build the atomic bomb. Uranium isotope separation facilities are built at Oak Ridge, Tennessee; plutonium production reactors are built at Hanford, Washington; and a weapons laboratory is set up at Los Alamos, New Mexico.
The Big Inch crude-oil pipeline is completed from the Texas oil fields to Pennsylvania.
The line serves as a transportation alternative to tankers that are being sunk by German submarines. The line also supplies export petroleum to the East Coast so that the reduced number of tankers can meet the demands of the European war fronts with the shorter-haul distance across the Atlantic.
Normandy France war
June 6, 1944
British and US troops successfully land on the Normandy beaches of France, opening a “Second Front” against the Germans.