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Manhattan Project Began
The Manhattan Project was a secret military project created in 1942 to produce the first US nuclear weapon. Fears that Nazi Germany would build and use a nuclear weapon during World War II triggered the start of the Manhattan Project, which was originally based in Manhattan, New York. -
Nazi Germany Invades Poland
The Invasion of Poland, known in Poland as the September Campaign or the 1939 Defensive War, and in Germany as the Poland Campaign, was an invasion of Poland by Germany that marked the beginning of World War II. -
Sitzkrieg
An eight-month period at the start of World War II, during which there was only one limited military land operation on the Western Front, when French troops invaded Germany's Saar district. -
France Fell to Germany
The battle took place from May 10th to June 25th in 1940 after the end of the period of waiting (Phoney War) following the German invasion of Poland in 1939. The Battle of France is remembered today as one of the most important battles of World War II in Europe and one of the early defining moments of the war. -
Battle of Britain
The Battle of Britain was a military campaign of the Second World War, in which the Royal Air Force defended the United Kingdom against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It has been described as the first major military campaign fought entirely by air forces. -
Destroyers-for-Bases Deal
In the Destroyers for Bases Agreement between the United States and the United Kingdom on September 2, 1940, fifty Caldwell, Wickes, and Clemson class US Navy destroyers were transferred to the Royal Navy from the United States Navy in exchange for land rights on British possessions. -
American First Committee Launched
The America First Committee was the foremost United States non-interventionist pressure group against the American entry into World War II. -
Congress Instituted the Draft
The nation's first military draft began in 1940, when President Roosevelt signed the Selective Training and Service Act. The draft continued through war and peacetime until 1973. More than 10 million men entered military service through the Selective Service System during World War II alone. -
Four Freedoms
Roosevelt insisted that people in all nations of the world shared Americans' entitlement to four freedoms: the freedom of speech and expression, the freedom to worship God in his own way, freedom from want and freedom from fear. -
Lead-Lease
The Lend-Lease policy, formally titled An Act to Promote the Defense of the United States, was an American program to defeat Germany, Japan and Italy by distributing food, oil, and materiel between 1941 and August 1945. -
USS Kearny Attacked
USS Kearny (DD-432), a Benson-Livermore-class destroyer, was a United States Navy warship during World War II. She was noted for being torpedoed by a German U-boat in October 1941, before the U.S. had entered the war. -
Reuben James Sank
USS Reuben James (DD-245)—a post-World War I, four-funnel Clemson-class destroyer—was the first United States Navy ship sunk by hostile action in the European theater of World War II. -
Japanese Attack On Pearl Habor
The Attack on Pearl Harbor happened on December 7th, 1941. Japanese airplanes made a surprise attack on the US Navy in Pearl Harbor. They destroyed many ships and killed many soldiers. It was this attack that forced the United States to enter World War II. -
Battle of Bataan
The siege of Bataan was the first major land battle for the Americans in World War II and one of the most-devastating military defeats in American history. The force on Bataan, numbering some 76,000 Filipino and American troops, is the largest army under American command ever to surrender. -
Bataan Death March
The Bataan Death March was the forcible transfer by the Imperial Japanese Army of 60,000–80,000 American and Filipino prisoners of war. -
Battle of Coral Sea
The Battle of the Coral Sea, fought from 4 to 8 May 1942, was a major naval battle between the Imperial Japanese Navy and naval and air forces from the United States and Australia, taking place in the Pacific Theatre of World War II. -
Battle of Midway
The Battle of Midway was a decisive naval battle in the Pacific Theater of World War II that took place between 4 and 7 June 1942, only six months after Japan's attack on Pearl Harbor and one month after the Battle of the Coral Sea. -
Battle of Stalingrad
The first reason is that the Battle of Stalingrad marked the end of Germany's advances into eastern Europe and Russia. The second reason is that this battle was the first major German loss during World War II. After the Germans lost in Stalingrad, they did not advance any farther into eastern Europe or Russia. -
Battle of El Alamein
The Battle of El Alamein was primarily fought between two of the outstanding commanders of World War Two, Montgomery, who succeeded the dismissed Auchinleck, and Rommel. The Allied victory at El Alamein lead to the retreat of the Afrika Korps and the German surrender in North Africa in May 1943. -
Island Hopping Campaign Begins
Leapfrogging, also known as island hopping, was a military strategy employed by the Allies in the Pacific War against Japan and the Axis powers during World War II. The idea was to bypass heavily fortified Japanese positions and instead concentrate the limited Allied resources on strategically important islands that were not well defended but capable of supporting the drive to the main islands of Japan. -
Casablanca Conference
The Casablanca Conference was held at the Anfa Hotel in Casablanca, French Morocco, from January 14 to 24, 1943, to plan the Allied European strategy for the next phase of World War II. In attendance were United States President Franklin D. Roosevelt and British prime minister Winston Churchill. -
Tehran Conference
The Tehran Conference was a strategy meeting of Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill from 28 November to 1 December 1943, after the Anglo-Soviet Invasion of Iran. It was held in the Soviet Union's embassy in Tehran, Iran. -
D-Day
On D-Day, 6 June 1944, Allied forces launched a combined naval, air and land assault on Nazi-occupied France. Codenamed Operation 'Overlord', the Allied landings on the Normandy beaches marked the start of a long and costly campaign to liberate north-west Europe from German occupation. -
MacArthur Returned to the Philippines
On October 20, 1944, a few hours after his troops landed, MacArthur waded ashore onto the Philippine island of Leyte. That day, he made a radio broadcast in which he declared, “People of the Philippines, I have returned!” In January 1945, his forces invaded the main Philippine island of Luzon. -
FDR Elected to a 4th Term
On this day in 1944, President Franklin Delano Roosevelt is elected to an unprecedented fourth term in office. By the time Roosevelt was elected to his fourth term, the war had taken a turn in favor of the Allies, but FDR's health was already on the decline -
Yalta Conference
The conference at Yalta held in the Crimea on February 4-11, 1945 brought together the Big Three Allied leaders. During this conference, Stalin, Churchill, and Roosevelt discussed Europe's postwar reorganization. The main purpose of Yalta was the re-establishment of the nations conquered and destroyed by Germany. -
Battle of Iwo Jima
The Battle of Iwo Jima was a major battle in which the United States Marine Corps landed on and eventually captured the island of Iwo Jima from the Imperial Japanese Army during World War II. -
Battle of Okinawa
It was the largest amphibious landing in the Pacific theater of World War II. It also resulted in the largest casualties with over 100,000 Japanese casualties and 50,000 casualties for the Allies. Thus, from the Japanese view Okinawa was and could be no more than a delaying battle of attrition on a grand scale. -
FDR Died/ Harry Truman Became President
President Franklin Delano Roosevelt passes away after four momentous terms in office, leaving Vice President Harry S. Truman in charge of a country still fighting the Second World War and in possession of a weapon of unprecedented and terrifying power. -
VE Day
Victory in Europe Day, generally known as VE Day or V-E Day, was celebrated on Tuesday, 8 May 1945 to mark the formal acceptance by the Allies of World War II of Nazi Germany's unconditional surrender of its armed forces. -
Potsdam Conference
The conference failed to settle most of the important issues at hand and thus helped set the stage for the Cold War that would begin shortly after World War II came to an end. The meeting at Potsdam was the third conference between the leaders of the Big Three nations. -
Little Boy Dropped on Hiroshima
The United States dropped an atomic bomb on the city of Hiroshima. The bomb was known as "Little Boy", a uranium gun-type bomb that exploded with about thirteen kilotons of force. -
Fat Man Dropped on Nagasaki
"Fat Man" was the codename for the nuclear bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945. It was the second of the only two nuclear weapons ever used in warfare, the first being Little Boy, and its detonation marked the third nuclear explosion in history. -
VJ Day
Victory over Japan Day is the day on which Imperial Japan surrendered in World War II, in effect bringing the war to an end. -
Nuremberg Trails
Nuremberg, Germany, was chosen as a site for trials that took place in 1945 and 1946. Judges from the Allied powers—Great Britain, France, the Soviet Union, and the United States—presided over the hearings of twenty-two major Nazi criminals. Twelve prominent Nazis were sentenced to death. -
Battle of the Bulge
The Battle of the Bulge, also known as the Ardennes Counteroffensive, took place from 16 December 1944 to 25 January 1945, and was the last major German offensive campaign on the Western Front during World War II. -
Japanese War Crime Trails
Japanese war crimes trial begins. In Tokyo, Japan, the International Military Tribunals for the Far East begins hearing the case against 28 Japanese military and government officials accused of committing war crimes and crimes against humanity during World War II.
