Century

20th Century

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Events

20th Century Timeline

Politics 20th Century Europe

Yalta Conference Opens in Crimea

As World War II neared its end in Europe, the Allied leaders needed to coordinate the final defeat of Nazi Germany and plan the postwar order. Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin met at the Livadia Palace near Yalta in the Crimea. The conference began on February 4, 1945, and lasted until February 11. Discussions covered the occupation of Germany, the creation of the United Nations, Soviet entry into the war against Japan, and the future of Eastern Europe. Agreements reached at Yalta shaped the division of Europe and the onset of the Cold War.

Event Detail US Military Atlas

Politics 20th Century Global

Allied Leaders Conclude Yalta Conference

As World War II neared its end in Europe, the leaders of the United States, United Kingdom, and Soviet Union met to coordinate final strategy against Nazi Germany and plan the postwar order. President Franklin D. Roosevelt, Prime Minister Winston Churchill, and Premier Joseph Stalin gathered at the Livadia Palace near Yalta in Crimea from February 4 to 11, 1945. On the final day, they signed the Declaration of a Liberated Europe committing to free elections in liberated countries and outlined occupation zones for Germany. The agreements also addressed Soviet entry into the war against Japan and the establishment of the United Nations. The conference produced protocols on prisoners of war and Polish borders. Though hailed at the time as...

Event Detail US Military Atlas

Military 20th Century Europe

Allied Bombing of Dresden Begins in World War II

As World War II neared its end in Europe, Allied commanders targeted German cities to disrupt transportation, industry, and morale in support of the advancing Soviet forces from the east. Dresden, a major rail hub with cultural significance, had not been heavily bombed earlier in the war. On the night of February 13, 1945, Royal Air Force bombers initiated a massive raid, followed by U.S. Army Air Forces daylight attacks over the next two days. The resulting firestorm destroyed much of the historic city center and killed an estimated 25,000 people.

Event Detail US Military Atlas

Military 20th Century East Asia

U.S. Marines Land on Iwo Jima

As the Pacific War entered its final phase in early 1945, U.S. planners targeted Iwo Jima to secure airfields for fighter escorts and emergency landings supporting B-29 raids on Japan. On February 19, approximately 30,000 Marines from the 4th and 5th Divisions stormed the black-sand beaches under heavy naval and air support. Japanese defenders, entrenched in an extensive tunnel network, held fire until the landing forces were ashore before unleashing devastating artillery and mortar fire. The initial assault secured a beachhead but at high cost, with casualties mounting rapidly in the volcanic terrain. The battle would last over a month and become one of the bloodiest in Marine Corps history.

Event Detail US Military Atlas

Military 20th Century East Asia

U.S. Marines Raise Flag on Mount Suribachi

In the Pacific Theater of World War II, U.S. Marines landed on Iwo Jima on February 19 to secure airfields for B-29 operations against Japan. After days of intense fighting against entrenched Japanese forces, a platoon reached the summit of Mount Suribachi on February 23. They raised a small U.S. flag around 10:30 a.m., followed later that day by a larger one captured in Joe Rosenthal's iconic photograph. The image of six Marines hoisting the flag symbolized American determination and became one of the war's most enduring symbols.

Event Detail US Military Atlas

Military 20th Century East Asia

U.S. Launches Devastating Firebombing of Tokyo

By early 1945, U.S. Army Air Forces shifted to low-altitude incendiary raids against Japanese cities after high-altitude precision bombing proved less effective. On the night of March 9, 334 B-29 Superfortress bombers took off from Pacific bases for Operation Meetinghouse. Pathfinders marked targets in eastern Tokyo with napalm, followed by waves dropping over 1,600 tons of incendiaries. The resulting firestorm consumed densely populated wooden districts, killing an estimated 80,000 to 100,000 people, mostly civilians, and leaving over a million homeless. The raid destroyed 16 square miles of the city.

Event Detail US Military Atlas

Military 20th Century East Asia

U.S. Firebombs Tokyo in Deadliest Air Raid

By early 1945, U.S. strategic bombing of Japan had shifted from precision strikes on industry to area incendiary attacks after earlier campaigns proved ineffective due to weather and Japanese dispersal of production. Under General Curtis LeMay, XXI Bomber Command launched Operation Meetinghouse on the night of March 9-10, 1945, sending 279 B-29 Superfortresses loaded with napalm-filled M69 incendiaries over Tokyo at low altitude. The resulting firestorm consumed densely packed wooden neighborhoods, destroying over 267,000 buildings and killing an estimated 90,000 to 100,000 people, mostly civilians. Japanese defenses were overwhelmed, with minimal losses to the attacking force. The raid became the single most destructive conventional bombing attack of the war and influenced subsequent tactics against other Japanese cities.

Event Detail US Military Atlas

Politics 20th Century Middle East & North Africa

Arab States Establish League of Arab States in Cairo

As World War II drew to a close, Arab leaders sought greater coordination amid rising nationalism and the looming question of Palestine’s future. Building on the 1944 Alexandria Protocol, representatives from Egypt, Iraq, Transjordan, Lebanon, Saudi Arabia, Syria, and Yemen convened in Cairo. On March 22, 1945, they signed the Pact of the League of Arab States, creating a regional organization with a council in which each member held one vote. The league aimed to strengthen economic ties, resolve internal disputes, and present a united political front on regional matters. Headquarters were established in Cairo, and the body later expanded to include additional Arab nations while pursuing initiatives such as a common market in the 1960s.

Military 20th Century East Asia

U.S. Forces Invade Okinawa in WWII

As Allied forces closed in on the Japanese home islands in spring 1945, planners selected Okinawa as a forward base for the anticipated invasion of Japan. The island's airfields and harbors offered critical staging areas within striking distance of the mainland. On April 1, 1945, U.S. Army and Marine units began amphibious landings on the western coast of Okinawa under Tenth Army command. Japanese defenders had prepared extensive fortifications inland rather than contesting the beaches directly. Initial advances met light resistance, allowing rapid seizure of airfields, but the campaign soon turned into a prolonged and costly battle. The operation ultimately secured the island after eighty-two days of fighting.

Event Detail US Military Atlas

Military 20th Century East Asia

U.S. Aircraft Sink Japanese Battleship Yamato

In the closing months of World War II in the Pacific, Japan faced mounting losses and prepared desperate measures to defend Okinawa. The massive battleship Yamato, flagship of the Imperial Japanese Navy and one of the largest ever built, was dispatched in Operation Ten-Go on a one-way mission to beach itself and support defenders with its massive guns. Detected by U.S. submarines and reconnaissance, the vessel and its escorts came under sustained attack on April 7, 1945, from hundreds of carrier-based aircraft. Hit by multiple bombs and torpedoes, Yamato capsized and sank after a catastrophic magazine explosion, with the loss of most of her crew.

Event Detail US Military Atlas

Military 20th Century Europe

US Forces Liberate Buchenwald Concentration Camp

As Allied armies advanced deep into Germany in April 1945, Nazi authorities ordered the evacuation of Buchenwald, a major concentration camp near Weimar holding political prisoners, Jews, Roma, and others. Prisoner resistance groups delayed evacuations and, on April 11, seized control of the camp after SS guards fled. Later that afternoon, elements of the U.S. Sixth Armored Division, part of the Third Army, entered the camp and found more than 21,000 survivors. The liberators encountered horrific conditions, including emaciated prisoners and evidence of mass deaths. The event became one of the first major revelations of Nazi camp atrocities to Western forces.

Event Detail US Military Atlas

Military 20th Century Europe

British Forces Liberate Bergen-Belsen Concentration Camp

In the closing weeks of World War II in Europe, as Allied armies advanced deep into Germany, British troops of the 11th Armoured Division reached the Bergen-Belsen camp near Celle on April 15. They found roughly 60,000 emaciated prisoners, many suffering from typhus and other diseases, along with thousands of unburied corpses scattered throughout the site. The camp, originally a prisoner-of-war facility, had become overcrowded with Jewish prisoners and others transferred from eastern camps ahead of the Soviet advance. Commandant Josef Kramer and remaining SS personnel were detained, and British medical teams began immediate efforts to treat survivors and contain the epidemic. The liberation revealed the full scale of Nazi atrocities to Western audiences through photographs and newsreels.

Event Detail US Military Atlas

Military 20th Century Europe

U.S. and Soviet Troops Meet on Elbe River

As World War II in Europe neared its end, advancing Allied and Soviet armies converged on Nazi-held territory from west and east. On April 25, 1945, U.S. reconnaissance units from the First Army encountered Soviet forces near Torgau and Strehla along the Elbe River in Germany. The meeting cut German forces in two, preventing organized retreat or reinforcement between fronts. Soldiers from both sides celebrated the linkup with handshakes and shared rations amid the ruins of war. This event became known as Elbe Day, symbolizing the impending defeat of Nazi Germany.

Event Detail US Military Atlas

Military 20th Century Europe

Italian Partisans Capture Benito Mussolini

By April 1945, Benito Mussolini's Italian Social Republic, a German puppet state in northern Italy, was collapsing under Allied advances and partisan uprisings. On April 25, Mussolini fled Milan disguised in a German uniform, traveling in a convoy toward the Swiss border with his mistress Clara Petacci and other Fascist officials. Early on April 27, the column was stopped at a partisan roadblock near Dongo on Lake Como by members of the 52nd Garibaldi Brigade. After negotiations allowing German troops to proceed, partisans searched the vehicles and discovered Mussolini hiding under a blanket in a truck. He was arrested, disarmed, and taken into custody; Petacci chose to remain with him. The capture ended Mussolini's flight and paved the way for...

Event Detail US Military Atlas

Politics 20th Century Europe

Benito Mussolini Executed by Italian Partisans

As Allied forces advanced through northern Italy in the final weeks of World War II in Europe, Benito Mussolini attempted to flee toward Switzerland disguised as a German soldier. Captured by local partisans near Lake Como on April 27, he and his mistress Clara Petacci were held overnight. On April 28, 1945, partisans executed Mussolini and Petacci by firing squad in the village of Giulino di Mezzegra. Their bodies were later transported to Milan and publicly displayed. The execution ended over two decades of Fascist rule in Italy.

Event Detail US Military Atlas

Military 20th Century Europe

U.S. Army Liberates Dachau Concentration Camp

As Allied armies advanced deep into Germany in the final weeks of World War II in Europe, units of the U.S. Seventh Army approached the Dachau complex, the first Nazi concentration camp opened in 1933. On April 29, soldiers from the 42nd and 45th Infantry Divisions encountered railroad cars filled with corpses and emaciated survivors, then accepted the surrender of remaining SS guards after brief resistance. Approximately 32,000 prisoners were freed that day, many of them political detainees, Jews, and others held since the camp’s early years. Troops documented the horrific conditions for later war-crimes proceedings.

Event Detail US Military Atlas

Military 20th Century Europe

Adolf Hitler Commits Suicide in Berlin Bunker

By late April 1945, Soviet forces had encircled Berlin in the final Battle of Berlin, and Nazi Germany's collapse was imminent. Adolf Hitler had retreated to the Führerbunker beneath the Reich Chancellery with close associates. On April 30, 1945, he married Eva Braun the previous day and then committed suicide by gunshot while she took cyanide. Their bodies were burned in the Chancellery garden per his instructions. The event was announced the next day on German radio, accelerating the unconditional surrender of German forces weeks later.

Event Detail US Military Atlas

Military 20th Century Europe

Soviet Forces Announce Capture of Berlin

After weeks of intense house-to-house fighting in the final days of World War II in Europe, Soviet troops under Marshal Georgy Zhukov and others encircled and assaulted the German capital. On May 2, 1945, the Soviet Union announced the fall of Berlin following the suicide of Adolf Hitler days earlier and the collapse of organized German resistance in the city. Simultaneously, the German surrender at Caserta took effect, ending hostilities in Italy. The announcement came after Soviet forces raised their flag over the Reichstag and secured key government districts. The battle had cost tens of thousands of lives on both sides and left the city in ruins. This event effectively marked the end of Nazi Germany in Europe.

Event Detail US Military Atlas

Military 20th Century Europe

Nazi Germany Signs Unconditional Surrender at Reims

By early May 1945, Allied forces had overrun much of Germany and Adolf Hitler had committed suicide, leaving Admiral Karl Dönitz as head of state. German General Alfred Jodl arrived at Supreme Headquarters Allied Expeditionary Force in Reims, France, to negotiate an end to hostilities. On May 7, 1945, shortly after 2 a.m., Jodl signed the unconditional surrender of all German forces on behalf of the German High Command. The document stipulated that fighting would cease at 11:01 p.m. on May 8. A separate ratification ceremony occurred in Berlin the following day to satisfy Soviet demands.

Event Detail US Military Atlas

Military 20th Century Europe

Germany Surrenders, Marking V-E Day

After years of intense fighting across Europe, Nazi Germany faced total defeat in the spring of 1945 as Allied forces from the west and Soviet armies from the east closed in on Berlin. Adolf Hitler had committed suicide on April 30, and his successor authorized surrender negotiations. The German Instrument of Surrender was signed in Reims on May 7 and ratified in Berlin on May 8. At 11:01 p.m. Central European Time on May 8, all hostilities in Europe officially ceased. Crowds celebrated in Allied capitals with parades, church bells, and street parties, though fighting continued in the Pacific. The day became known as Victory in Europe Day or V-E Day.

Event Detail US Military Atlas

Politics 20th Century Global

United Nations Charter Signed by 50 Nations

World War II was nearing its end in Europe when delegates from 50 countries gathered in San Francisco for the United Nations Conference on International Organization. The conference aimed to create a new global body to prevent future conflicts after the failures of the League of Nations. On June 26, 1945, representatives signed the United Nations Charter in the Herbst Theatre, establishing the framework for the UN with its principal organs including the Security Council, General Assembly, and International Court of Justice. The document outlined commitments to maintain peace, promote human rights, and foster international cooperation. It required ratification by the five permanent Security Council members and a majority of signatories before taking effect later that year.

Event Detail US Military Atlas

Science 20th Century North America

First Atomic Bomb Tested at Trinity Site

In the final months of World War II, the United States raced to develop nuclear weapons through the Manhattan Project amid fears that Nazi Germany might achieve the same capability first. Scientists led by J. Robert Oppenheimer constructed and tested a plutonium implosion device in the remote Jornada del Muerto desert of New Mexico. At 5:29 a.m. on July 16, 1945, the device detonated with a yield of about 21 kilotons, producing a mushroom cloud and glassifying the desert sand into trinitite. The successful test confirmed the feasibility of atomic weapons and ushered in the nuclear age. The blast was visible for hundreds of miles and registered on seismographs across the region.

Event Detail Guided Physics

Politics 20th Century Europe

Potsdam Conference Opens Among Allied Leaders

With Germany surrendered in May 1945, the final wartime meeting of the Big Three—U.S. President Harry Truman, British Prime Minister Winston Churchill (later replaced by Clement Attlee), and Soviet leader Joseph Stalin—convened to shape postwar Europe and address Japan. Held at Cecilienhof Palace in Potsdam near Berlin from July 17 to August 2, the conference addressed occupation zones, reparations, German demilitarization, and the Potsdam Declaration demanding Japan's unconditional surrender. Truman, newly informed of the successful atomic bomb test, adopted a firmer stance toward Stalin amid growing suspicions over Soviet intentions in Eastern Europe. Discussions revealed emerging fractures in the wartime alliance.

Event Detail US Military Atlas

Military 20th Century North America

Japanese Submarine Sinks USS Indianapolis

In the final weeks of World War II in the Pacific, the heavy cruiser USS Indianapolis had completed a secret mission delivering atomic bomb components to Tinian. Departing Guam for Leyte, the ship sailed unescorted through waters where Japanese submarines remained active. Just after midnight on July 30, 1945, the submarine I-58 fired two torpedoes that struck the vessel, causing rapid flooding and structural failure. The Indianapolis sank in approximately twelve minutes, taking nearly 300 crew members down with her. Roughly 900 survivors entered the water with limited lifeboats, facing days of exposure, dehydration, and shark attacks before rescue began on August 2.

Event Detail US Military Atlas