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The Yalta Conference took place in a Russian resort town in the Crimea from February 4-11, 1945, during World War Two. At Yalta, U.S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Soviet Premier Joseph Stalin made important decisions regarding the future progress of the war and the postwar world.

World Leaders at the Yalta Conference

The Allied leaders came to Yalta knowing that an Allied victory in Europe was practically inevitable but less convinced that the Pacific war was nearing an end. Recognizing that a victory over Japan might require a protracted fight, the United States and Great Britain saw a major strategic advantage to Soviet participation in the Pacific theater. At Yalta, Roosevelt and Churchill discussed with Stalin the conditions under which the Soviet Union would enter the war against Japan and all three agreed that, in exchange for potentially crucial Soviet participation in the Pacific theater, the Soviets would be granted a sphere of influence in Manchuria following Japan's surrender. This included the southern portion of Sakhalin, a lease at Port Arthur (now Lüshunkou), a share in the operation of the Manchurian railroads, and the Kurile Islands. This agreement was the major concrete accomplishment of the Yalta Conference.

The Allied leaders also discussed the future of Germany, Eastern Europe and the United Nations. Roosevelt, Churchill, and Stalin agreed not only to include France in the postwar governing of Germany, but also that Germany should assume some, but not all, responsibility for reparations following the war. The Americans and the British generally agreed that future governments of the Eastern European nations bordering the Soviet Union should be "friendly" to the Soviet regime while the Soviets pledged to allow free elections in all territories liberated from Nazi Germany. Negotiators also released a declaration on Poland, providing for the inclusion of Communists in the postwar national government. In discussions regarding the future of the United Nations, all parties agreed to an American plan concerning voting procedures in the Security Council, which had been expanded to five permanent members following the inclusion of France. Each of these permanent members was to hold a veto on decisions before the Security Council.

Initial reaction to the Yalta agreements was celebratory. Roosevelt and many other Americans viewed it as proof that the spirit of U.S.-Soviet wartime cooperation would carry over into the postwar period. This sentiment, however, was short lived. With the death of Franklin D. Roosevelt on April 12, 1945, Harry S. Truman became the thirty-third president of the United States. By the end of April, the new administration clashed with the Soviets over their influence in Eastern Europe, and over the United Nations. Alarmed at the perceived lack of cooperation on the part of the Soviets, many Americans began to criticize Roosevelt's handling of the Yalta negotiations. To this day, many of Roosevelt's most vehement detractors accuse him of "handing over" Eastern Europe and Northeast Asia to the Soviet Union at Yalta despite the fact that the Soviets did make many substantial concessions.

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Milestones: 1937-1945 - Office of the Historian

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Berlin Blockade - 1948 | Today In History | 24 June 18

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On March 12, 1947, President Harry Truman urges a joint session of Congress to support his doctrine, which calls for U.S. financial and military aid to Greece and Turkey in an effort to protect the countries from Soviet domination.

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Listen to The Truman Doctrine | HISTORY Channel

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On March 12, 1947, President Harry Truman urges a joint session of Congress to support his doctrine, which calls for U.S. financial and military aid t...

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JFK's Pledge Leads to Start of Apollo Program

The American effort to send astronauts to the moon had its origins in an appeal President Kennedy made to a special joint session of Congress on May 25, 1961: "I believe this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to Earth."

At the time, the United States was still trailing the Soviet Union in space developments, and Cold War-era America welcomed Kennedy's bold proposal. In 1966, after five years of work by an international team of scientists and engineers, the National Aeronautics and Space Administration (NASA) conducted the first unmanned Apollo mission, testing the structural integrity of the proposed launch vehicle and spacecraft combination.

Then, on January 27, 1967, tragedy struck at Kennedy Space Center in Cape Canaveral, Florida, when a fire broke out during a manned launch-pad test of the Apollo spacecraft and Saturn rocket. Three astronauts were killed in the fire.

President Richard Nixon spoke with Armstrong and Aldrin via a telephone radio transmission shortly after they planted the American flag on the lunar surface. Nixon considered it the "most historic phone call ever made from the White House."

Despite the setback, NASA and its thousands of employees forged ahead, and in October 1968, Apollo 7, the first manned Apollo mission, orbited Earth and successfully tested many of the sophisticated systems needed to conduct a moon journey and landing.

In December of the same year, Apollo 8 took three astronauts to the far side of the moon and back, and in March 1969 Apollo 9 tested the lunar module for the first time while in Earth orbit. That May, the three astronauts of Apollo 10 took the first complete Apollo spacecraft around the moon in a dry run for the scheduled July landing mission.

Timeline of the 1969 Moon Landing

At 9:32 a.m. EDT on July 16, with the world watching, Apollo 11 took off from Kennedy Space Center with astronauts Neil Armstrong, Buzz Aldrin and Michael Collins (1930-) aboard. Armstrong, a 38-year-old civilian research pilot, was the commander of the mission.

After traveling 240,000 miles in 76 hours, Apollo 11 entered into a lunar orbit on July 19. The next day, at 1:46 p.m., the lunar module Eagle, manned by Armstrong and Aldrin, separated from the command module, where Collins remained. Two hours later, the Eagle began its descent to the lunar surface, and at 4:17 p.m. the craft touched down on the southwestern edge of the Sea of Tranquility. Armstrong immediately radioed to Mission Control in Houston, Texas, a now-famous message: "The Eagle has landed."

At 10:39 p.m., five hours ahead of the original schedule, Armstrong opened the hatch of the lunar module. As he made his way down the module's ladder, a television camera attached to the craft recorded his progress and beamed the signal back to Earth, where hundreds of millions watched in great anticipation.

At 10:56 p.m., as Armstrong stepped off the ladder and planted his foot on the moon's powdery surface, he spoke his famous quote, which he later contended was slightly garbled by his microphone and meant to be "that's one small step for a man, one giant leap for mankind."

Aldrin joined him on the moon's surface 19 minutes later, and together they took photographs of the terrain, planted a U.S. flag, ran a few simple scientific tests and spoke with President Richard Nixon (1913-94) via Houston.

By 1:11 a.m. on July 21, both astronauts were back in the lunar module and the hatch was closed. The two men slept that night on the surface of the moon, and at 1:54 p.m. the Eagle began its ascent back to the command module. Among the items left on the surface of the moon was a plaque that read: "Here men from the planet Earth first set foot on the moon-July 1969 A.D.-We came in peace for all mankind."

At 5:35 p.m., Armstrong and Aldrin successfully docked and rejoined Collins, and at 12:56 a.m. on July 22 Apollo 11 began its journey home, safely splashing down in the Pacific Ocean at 12:50 p.m. on July 24.

How Many Times Did the US Land on the Moon?

There would be five more successful lunar landing missions, and one unplanned lunar swing-by. Apollo 13 had to abort its lunar landing due to technical difficulties. The last men to walk on the moon, astronauts Eugene Cernan (1934-2017) and Harrison Schmitt (1935-) of the Apollo 17 mission, left the lunar surface on December 14, 1972.

The Apollo program was a costly and labor-intensive endeavor, involving an estimated 400,000 engineers, technicians and scientists, and costing $24 billion (close to $100 billion in today's dollars). The expense was justified by Kennedy's 1961 mandate to beat the Soviets to the moon, and after the feat was accomplished, ongoing missions lost their viability.

HISTORY Vault: Moon Landing: The Lost Tapes

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1969 Moon Landing - Date, Facts, Video | HISTORY

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On July 20, 1969, two American astronauts landed on the moon and became the first humans to walk on the lunar surface. The event marked the culmination of a nearly decade-long intense push to meet a challenge posed by President John F. Kennedy.

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November 22, 1963 - Errol Morris JFK Assassination Documentary | Op-Docs | The New York Times

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Table of Contents

1. The Berlin Wall: The Partitioning of Berlin

2. The Berlin Wall: Blockade and Crisis

3. The Berlin Wall: Building the Wall

4. The Berlin Wall: 1961-1989

5. The Berlin Wall: The Fall of the Wall

On August 13, 1961, the Communist government of the German Democratic Republic (GDR, or East Germany) began to build a barbed wire and concrete "Antifascistischer Schutzwall," or "antifascist bulwark," between East and West Berlin. The official purpose of this Berlin Wall was to keep so-called Western "fascists" from entering East Germany and undermining the socialist state, but it primarily served the objective of stemming mass defections from East to West. The Berlin Wall stood until November 9, 1989, when the head of the East German Communist Party announced that citizens of the GDR could cross the border whenever they pleased. That night, ecstatic crowds swarmed the wall. Some crossed freely into West Berlin, while others brought hammers and picks and began to chip away at the wall itself. To this day, the Berlin Wall remains one of the most powerful and enduring symbols of the Cold War.

The Berlin Wall: The Partitioning of Berlin

Berlin's Animal Arms Race

As World War II came to an end in 1945, a pair of Allied peace conferences at Yalta and Potsdam determined the fate of Germany's territories. They split the defeated nation into four "allied occupation zones": The eastern part of the country went to the Soviet Union, while the western part went to the United States, Great Britain and (eventually) France.

Even though Berlin was located entirely within the Soviet part of the country (it sat about 100 miles from the border between the eastern and western occupation zones), the Yalta and Potsdam agreements split the city into similar sectors. The Soviets took the eastern half, while the other Allies took the western. This four-way occupation of Berlin began in June 1945.

The Berlin Wall: Blockade and Crisis

The existence of West Berlin, a conspicuously capitalist city deep within communist East Germany, "stuck like a bone in the Soviet throat," as Soviet leader Nikita Khrushchev put it. The Russians began maneuvering to drive the United States, Britain and France out of the city for good. In 1948, a Soviet blockade of West Berlin aimed to starve the western Allies out of the city. Instead of retreating, however, the United States and its allies supplied their sectors of the city from the air. This effort, known as the Berlin Airlift, lasted for more than a year and delivered more than 2.3 million tons of food, fuel and other goods to West Berlin. The Soviets called off the blockade in 1949.

Did you know? On October 22, 1961, a quarrel between an East German border guard and an American official on his way to the opera in East Berlin very nearly led to what one observer called "a nuclear-age equivalent of the Wild West Showdown at the O.K. Corral." That day, American and Soviet tanks faced off at Checkpoint Charlie for 16 hours. Photographs of the confrontation are some of the most familiar and memorable images of the Cold War.

After a decade of relative calm, tensions flared again in 1958. For the next three years, the Soviets-emboldened by the successful launch of the Sputnik satellite the year before during the " Space Race " and embarrassed by the seemingly endless flow of refugees from east to west (nearly 3 million since the end of the blockade, many of them young skilled workers such as doctors, teachers and engineers)-blustered and made threats, while the Allies resisted. Summits, conferences and other negotiations came and went without resolution.

Meanwhile, the flood of refugees continued. In June 1961, some 19,000 people left the GDR through Berlin. The following month, 30,000 fled. In the first 11 days of August, 16,000 East Germans crossed the border into West Berlin, and on August 12 some 2,400 followed-the largest number of defectors ever to leave East Germany in a single day.

The Berlin Wall: Building the Wall

That night, Premier Khrushchev gave the East German government permission to stop the flow of emigrants by closing its border for good. In just two weeks, the East German army, police force and volunteer construction workers had completed a makeshift barbed wire and concrete block wall -the Berlin Wall-that divided one side of the city from the other.

Before the wall was built, Berliners on both sides of the city could move around fairly freely: They crossed the East-West border to work, to shop, to go to the theater and the movies. Trains and subway lines carried passengers back and forth. After the wall was built, it became impossible to get from East to West Berlin except through one of three checkpoints: at Helmstedt ("Checkpoint Alpha" in American military parlance), at Dreilinden ("Checkpoint Bravo") and in the center of Berlin at Friedrichstrasse ("Checkpoint Charlie"). (Eventually, the GDR built 12 checkpoints along the wall.) At each of the checkpoints, East German soldiers screened diplomats and other officials before they were allowed to enter or leave. Except under special circumstances, travelers from East and West Berlin were rarely allowed across the border.

The Berlin Wall: 1961-1989

The construction of the Berlin Wall did stop the flood of refugees from East to West, and it did defuse the crisis over Berlin. (Though he was not happy about it, President John F. Kennedy conceded that "a wall is a hell of a lot better than a war.") Almost two years after the Berlin Wall was erected, John F. Kennedy delivered one of the most famous addresses of his presidency to a crowd of more than 120,000 gathered outside West Berlin's city hall, just steps from the Brandenburg Gate. Kennedy's speech has been largely remembered for one particular phrase. "I am a Berliner."

In all, at least 171 people were killed trying to get over, under or around the Berlin Wall. Escape from East Germany was not impossible, however: From 1961 until the wall came down in 1989, more than 5,000 East Germans (including some 600 border guards) managed to cross the border by jumping out of windows adjacent to the wall, climbing over the barbed wire, flying in hot air balloons, crawling through the sewers and driving through unfortified parts of the wall at high speeds.

The Berlin Wall: The Fall of the Wall

On November 9, 1989, as the Cold War began to thaw across Eastern Europe, the spokesman for East Berlin's Communist Party announced a change in his city's relations with the West. Starting at midnight that day, he said, citizens of the GDR were free to cross the country's borders. East and West Berliners flocked to the wall, drinking beer and champagne and chanting "Tor auf!" ("Open the gate!"). At midnight, they flooded through the checkpoints.

More than 2 million people from East Berlin visited West Berlin that weekend to participate in a celebration that was, one journalist wrote, "the greatest street party in the history of the world." People used hammers and picks to knock away chunks of the wall-they became known as "mauerspechte," or "wall woodpeckers"-while cranes and bulldozers pulled down section after section. Soon the wall was gone and Berlin was united for the first time since 1945. "Only today," one Berliner spray-painted on a piece of the wall, "is the war really over."

The reunification of East and West Germany was made official on October 3, 1990, almost one year after the fall of the Berlin Wall.

HISTORY Vault: Declassified: Rise and Fall of the Wall

Mine formerly guarded vaults and archives around the world to reveal untold stories about the brutal life and catastrophic death of the Berlin Wall, a central symbol of the 20th century's longest and deadliest war.

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On August 13, 1961, the Communist government of East Germany began to build a barbed wire and concrete "Antifascistischer Schutzwall," or "antifascist bulwark," between East and West Berlin. The official purpose of the Berlin Wall was to keep Western "fascists" from entering East Germany and undermining the socialist state, but it primarily served the objective of stemming mass defections from East to West.

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17th April 1961: The Bay of Pigs invasion launched by Brigade 2506

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Kennedy vs. Nixon: The third 1960 presidential debate

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In July 1959, Vice President Richard Nixon traveled to Moscow to open the U.S. Trade and Cultural Fair in Sokolniki Park. In the kitchen of the exhibit's model house built by General Electric, Nixon and Soviet Premier Nikita Khrushchev began an impromptu series of debates on the merits of capitalism and communism. An audio segment of one of the exchanges, which was filmed by the American company Ampex on the first videotape recorder, illustrates the Cold War tensions simmering beneath the surface.

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Listen to The Kitchen Debate | HISTORY Channel

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In July 1959, Vice President Richard Nixon traveled to Moscow to open the U.S. Trade and Cultural Fair in Sokolniki Park. In the kitchen of the exhibit's model house built by General Electric, Nixon and Soviet Premier Nikita Khrushchev began an impromptu series of debates on the merits of capitalism and communism.

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The Sputnik 1 Launch: The First Artificial Satellite To Enter Earth's Orbit | Mach | NBC News

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Korean War Begins - 1950 | Today In History | 25 June 17

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Historian Yohuru Williams explains how the fear of communist influences in America grew into a phenomenon known as "the Red Scare."

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Cuban Revolution - 1959 | Today in History | 1 Jan 17