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The invasion of Poland, also known as the September Campaign, Polish Campaign, and Polish Defensive War of 1939, was a joint attack on the Republic of Poland by Nazi Germany, the Slovak Republic, and the Soviet Union, which marked the beginning of World War II. -
Great Britain and France declared war on Nazi Germany, following Germany's invasion of Poland on September 1. Fulfilling their treaty obligations to defend Poland, British Prime Minister Neville Chamberlain and French leadership initiated the conflict. -
known as the Battle of France or Fall Gelb (Case Yellow), was a successful Blitzkrieg campaign that bypassed the Maginot Line. -
rescued 338,226 Allied soldiers trapped by German forces in northern France. This "Miracle of Dunkirk" saved the British Expeditionary Force from destruction through a massive, hasty rescue by navy vessels and "little ships". Despite losing nearly all heavy equipment, it preserved vital manpower for Britain. -
he Battle of Britain (July-October 1940) was World War II's first major air campaign, where Britain's Royal Air Force (RAF) successfully defended the UK against large-scale air attacks by Nazi Germany's Luftwaffe -
Signed by President Franklin D. Roosevelt on September 16, 1940, the Selective Training and Service Act established the first peacetime draft in U.S. history, requiring men aged 21 to 35 to register. -
The Lend-Lease Act (March 1941) allowed the U.S. to supply Allied nations (principally UK, Soviet Union, China) with war materiel—ships, planes, weapons—on credit during WWII, circumventing cash-and-carry requirements. -
On December 7, 1941, the Japanese military launched a surprise attack on the U.S. Naval base at Pearl Harbor. The attack killed 2,403 service members and wounded 1,178 more, and sank or destroyed six U.S. ships. -
The United States officially entered World War II on December 8, 1941, one day after Japan's surprise attack on Pearl Harbor. Following the attack that killed over 2,400 Americans, President Franklin D. Roosevelt declared Dec. 7, 1941, "a date which will live in infamy," prompting a swift Congressional declaration of war against Japan. -
On December 11, 1941, Germany and Italy formally declared war on the United States, following the Japanese attack on Pearl Harbor just days earlier. This declaration was influenced by President Franklin D. Roosevelt's stance against the Axis powers and escalating U.S. actions perceived as hostile. -
The Battle of the Coral Sea (May 4-8, 1942) was a pivotal naval engagement where U.S. and Australian forces fought the Japanese to stop their invasion of Port Moresby, marking the first naval battle fought entirely by aircraft from carriers, with neither fleet ever seeing the other. -
The Battle of Midway (June 4–7, 1942) was a pivotal naval battle in the Pacific Theater of World War II, where U.S. forces decisively defeated a major Japanese attack, destroying four Japanese aircraft carriers and shifting the war's momentum -
After Operation Torch, the Anglo-American landings in North-West Africa in November 1942 and fighting against Vichy France forces (which then changed sides), the Allies trapped about 250,000 German and Italian personnel in northern Tunisia, forcing their surrender in May 1943. -
The 1943 Allied invasions of Sicily (Operation Husky) and mainland Italy were pivotal WWII campaigns that knocked Italy out of the war, forced the fall of Mussolini, and opened a new front against Germany -
On June 6, 1944, Allied forces launched Operation Overlord (D-Day), the largest amphibious invasion in history, landing over 150,000 troops on five Normandy beaches (Utah, Omaha, Gold, Juno, Sword) in France. This pivotal WWII operation broke through German defenses, beginning the successful liberation of Western Europe. -
Allied forces discovered Nazi concentration camps between 1944 and 1945 as they advanced across Europe, uncovering horrific evidence of the Holocaust. Major sites like Auschwitz and Treblinka were found by Soviet, American, and British troops, revealing the systemic murder and brutality of the Nazi regime -
The Battle of the Bulge was Hitler's desperate, final major offensive on the Western Front (Dec 16, 1944–Jan 25, 1945), a surprise German attack through the Ardennes Forest aimed at splitting Allied lines and reaching Antwerp -
At Yalta, Roosevelt and Churchill discussed with Stalin the conditions under which the Soviet Union would enter the war against Japan -
V-E (Victory in Europe) Day, celebrated on May 8, 1945, marks the formal acceptance of Nazi Germany's unconditional surrender by the Allies, ending World War II in Europe. It commemorates the end of nearly six years of conflict, with massive public celebrations in the UK, US, and other nations. -
The U.S. bombed Hiroshima with the atomic bomb on August 6, 1945, primarily to force Japan's unconditional surrender and end World War II quickly, avoiding a costly land invasion and saving American lives, while also demonstrating the weapon's power to the world and potentially the Soviet Union -
The U.S. bombed Nagasaki on August 9, 1945, to force Japan's swift surrender in World War II, aiming to avoid a costly U.S. invasion, demonstrate the devastating power of the new atomic weapon, and send a strong message to the Soviet Union about American power as the war ende -
V-J Day (Victory over Japan Day) marks the end of WWII, commemorating Japan's surrender announced on August 15, 1945, and formally signed on September 2, 1945, aboard the USS Missouri. While the U.S. traditionally marks the event on September 2, the UK and other nations often observe it on August 15.