| World War
II, the largest and most destructive conflict fought in human
history, began in September 1939, when German leader
Adolf Hitler
directed his army to invade
Poland. The
Polish invasion provoked declarations of war from Poland's
allies,
Great Britain and
France. In
Asia, the
Sino-Japanese War of 1937-1945
began with the Japanese invasion
of
China in July 1937, and many historians consider that event the
first battle of World War II.
Germany,
Italy, and
Japan had formed the
Axis alliance in May 1939 and committed themselves to world
conquest. After Germany invaded western Poland on September 1, the
Soviet Union
invaded eastern Poland on September 17. The two invading
countries had made a secret agreement to divide Poland and allow
several Baltic states to be in the Soviet
sphere of influence. After Poland was defeated in early October,
the Soviets forced
Estonia,
Latvia, and
Lithuania to allow Russian troops on their soil. The Soviets
next turned to
Finland, which refused to cooperate, leading to the
Russo-Finnish War. Although Soviet forces finally broke through
the
Mannerheim Line
in February 1940, they suffered heavy losses,
which led the rest of the world to underestimate Soviet military
capabilities.
German dive bombers continue blitzkrieg

German JU-87 dive bombers, commonly known as Stukas, fly in
formation on April 30, 1940. The blitzkrieg attacks of Spring 1940,
led by these airplanes, ended the Phony War, a deceptive lull in
fighting after the invasion of Poland that Germany used to gear up
its arsenal.
[Hulton|Archive by Getty Images ]
Germany, France, and Britain, meanwhile, had entered a period
known as the
Phony War, which mainly involved
blockades, mine laying, and sporadic naval action. That six-month
lull ended in April 1940, when Germany invaded
Denmark and
Norway. Hitler followed that action with a
blitzkrieg attack on France on May
10, 1940. By June 22, the
Battle of France was over, and Germany now occupied
Belgium, France,
Luxembourg, and the
Netherlands. Italy, which chose to remain neutral during the
early stages of the war in
Europe, had finally declared war on Britain and France on June
10.
Operation Barbarossa
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German troops fight in the Soviet
Union during
Operation Barbarossa in 1941. Though the Nazi
invasion came as a complete surprise (in part because of a
mutual nonaggression pact signed two years earlier), the maneuver
eventually backfired, causing the Germans to wage a costly
two-front war leading to their eventual defeat.
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Hitler now set his sights on Britain, but the German Army was
stymied by British resistance during the
Battle of Britain and turned east to launch
Operation
Barbarossa,
the code name for the German invasion of the Soviet Union in June
1941. That decision proved to be a costly blunder, however, as stiff
Soviet resistance, particularly during the
siege of Leningrad, drained German resources and manpower. The
United States remained neutral in the summer of 1941, but
President
Franklin D. Roosevelt steered massive amounts of economic and
military aid to the
Allies—Britain, France, and the Soviet Union—through the
lend-lease program.

Japanese aircraft carrier Shokaku under attack by the USS Yorktown on May 8, 1942 during the Battle of the Coral Sea.
[Naval Historical Center]
Although Japan controlled large areas of China by 1941, the
Japanese military had grown weary of China's
guerrilla warfare tactics and turned its attention instead to
Southeast Asia. After Japan invaded Indochina on July 26, 1941,
Roosevelt froze all Japanese assets in America, a maneuver that cut
off all trade between the two nations and deprived Japan of crucial
U.S. oil supplies. In response, Japan's leaders decided to wage a
war against the United States and launched a surprise air attack on
the U.S. naval base at
Pearl Harbor, Hawaii on December 7; the United States declared
war on Japan the following day. On December 11, Japan's allies,
Germany and Italy, declared war on the United States.
The U.S. Pacific fleet emerged from the Pearl Harbor attack
severely crippled, and without naval protection, U.S. forces in the
Philippines and other Pacific islands were quickly overrun. The
British faired no better; they lost
Hong Kong on December 25 and were crushed at the
Battle of Singapore
in February 1942, resulting in the loss of
the Malay Peninsula to the Japanese. The Netherlands suffered the
same fate; Japan controlled most of the Dutch East Indies
(present-day
Indonesia)
by the end of February.
With U.S. industry producing ships, planes, and
submarines at record rates, the
U.S. Navy quickly recovered from its debacle at Pearl Harbor. In
May 1942, in the
Battle of the Coral Sea, the
Americans dealt a severe blow to the Japanese. In June, the
Battle of Midway again demonstrated growing U.S. superiority in
both weapons and in the tactics of carrier-based naval operations.
At the same time, the U.S. submarine fleet was wreaking havoc on
Japanese military and commercial shipping by choking off the island
nation from vital supplies.

During World War II, Jimmy Doolittle led the audacious April 1942
bombing raid on Japan from the decks of an aircraft carrier. He was
one of the most important generals to serve in the conflict.
[Hulton Archive]
Meanwhile, U.S. general
Douglas MacArthur began a strategy of "island
hopping," by which U.S. forces took control of the many isolated
Japanese outposts in the
Pacific theater. He moved first on New Guinea and then launched
an invasion of Japanese outposts in the neighboring
Solomon Islands; he took
Guadalcanal after terrible fighting in February 1943. U.S.
forces moved ever closer to mainland Japan by taking Guam and Saipan
in the Mariana Islands in the summer of 1944.

Gen. Douglas MacArthur was one of the most controversial soldiers
in U.S. history. Although he commanded a successful army in the
Pacific during World War II, he was later dismissed by President
Harry S. Truman for disobeying orders during the Korean War.
In October of that year, MacArthur led a powerful invasion force
to the Philippines. There, off the island of Leyte, in what became
known as the
Battle of Leyte Gulf, the U.S. Navy dealt the Japanese fleet
another near-fatal blow. The conquest of the Philippines was largely
complete by March 1945, and in April, U.S. marines took the island
of Okinawa, very near the Japanese coast. The stage was now set for
a final, massive invasion of Japan itself.

U.S. marines of the 1st Division climb a seawall during the
Inchon invasion on September 15, 1950. The Inchon landing was a
brilliant strategic coup that turned the tide of the war against
North Korea.
[National Archive]
In the
European theater during 1942-1943, German forces in the Soviet
Union remained bogged down at Leningrad and suffered devastating
losses at the
Battle of Stalingrad, resulting in a full-scale German retreat
from the
Eastern Front in early 1943. Meanwhile, the
British Royal Air Force and the
U.S. Air Force had intensified the Allied bombing campaign in
1942 and seriously damaged German industrial capacity. Not yet
prepared to invade German-occupied France, Roosevelt and British
prime minister
Winston Churchill
decided to first challenge the German Army in
the
North African campaign.

British prime minister Winston Churchill speaks at Westminster
College in Fulton, Missouri on March 4, 1946. In his famous speech,
Churchill coined the term "iron curtain" as he painted a picture of
the post-World War II world and the emerging struggle between
democracy and communism.
[AP/Wide World Photos]
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badge identifying slave laborer
during World War II |
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Five-sided badge issued to
Helen Waterford identifying her as a prisoner from the
Kratzau-Chrastava labor camp, a satellite camp of Gross
Rosen in Czechoslovakia during World War II.
[Helen Waterford, courtesy of USHMM Photo Archives
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Striking out from Casablanca in
Morocco in November 1942, British and U.S. forces under Lt. Gen.
Dwight D. Eisenhower
conquered areas of
Algeria held by the French
Vichy regime (a puppet government
set up by Hitler after his conquest of France). Moving east, the
Allied forces met the Germans in an important engagement at the
Kasserine Pass in February 1943 and finally forced a German
surrender of all of
Tunisia in May that same year.
Next, the Allies prepared for the
Italian Peninsular campaign. On July 10, 1943, U.S. and British
forces began the
Sicily invasion; the Italians rebelled against fascist ruler
Benito Mussolini, whom King
Victor Emmanuel III arrested on July 25. Then, on September 2,
the Allies began invading mainland Italy, and Italy surrendered six
days later. In response, the Germans invaded Rome and restored the
fallen Italian
dictator. Fighting against German troops, the Allied advance
slowed, but a risky landing behind German lines on a beach at Anzio
in January 1944 eventually succeeded, and American forces entered
Rome on June 4.
Two days later, on June 6, 1944, Allied forces landed on the
coast of France in what became known as the
D-Day invasion. Fighting was brutal, but the Allies managed to
take control of several beachheads, which they would expand in the
following months as they drove on into Germany.
Free French Forces, fighting under resistance leader Gen.
Charles de Gaulle, and U.S. troops entered Paris on August 25 to
the delirious cheers of liberated Parisians.
While another invasion force entered France from the south and
bombing raids from
England continued to destroy homes and industry in Germany, the
Allies pushed on to the German frontier on the Rhine River. There,
on December 16, the Germans mounted one final, desperate offensive
against the relatively weak center of the U.S. lines. Known as the
Battle of the Bulge, it did not last long. Hitler's armies were
running out of resources, including crucial fuel supplies, and were
throwing inexperienced boys and old men into their ranks to make up
for increasing losses. Fighting in bitter cold, the Allies pushed
the Germans back for the last time.
Now all that remained was to push on into Germany toward the
capital in Berlin. Earlier in the war, Roosevelt and Churchill had
agreed that they would accept nothing short of unconditional
surrender from the Germans. Soviet leader
Joseph Stalin
was not likely to settle for anything less,
either, as the Soviets had done the heaviest fighting of the entire
war. The battles on the Eastern Front were the biggest in human
history, and losses—in military personnel, equipment, and civilian
casualties—were staggering.
The Soviets had also encountered the brunt of the Germans'
death camps—including
Auschwitz—in eastern Europe, where Hitler had attempted to
annihilate the Jewish race and any "inferior," non-Aryan
peoples who challenged the
Nazi Party's views of racial purity. Many of the millions of
victims of the
Holocaust had been Soviet citizens before the war, and Soviet
losses over the course of the war totaled as many as 25 million
people killed.
By early 1945, the combined effect of Allied bombing, invading
U.S. and British troops from the west, and vengeful Soviets in the
east had reduced much of Germany to rubble. The Soviets carried out
the attack on Berlin and captured it by the end of April. Hitler
committed suicide in his bunker beneath Berlin on April 30 as the
Soviets closed in. On May 8,
V-E Day, remaining German forces finally surrendered
unconditionally to the Allies.
The war in Europe was over, but Japan still remained undefeated.
The prospect of invading the island nation was daunting, especially
in the face of projected bitter resistance from the Japanese people.
Roosevelt had died in April, and when Vice President
Harry Truman succeeded to the presidency, he learned of the
newest and deadliest U.S. weapon—the
atomic bomb. U.S. military leaders urged its use to force the
Japanese into surrender.

Hoping to end the war rapidly with minimal loss of American life,
Truman gave the order to drop an atomic bomb on the city of
Hiroshima when the Japanese refused to surrender unconditionally. On
August 6, 1945, a U.S. plane named the
Enola Gay dropped the first of two bombs, which instantly
killed 80,000 people and caused unprecedented damage. Three days
later, after the Japanese still did not surrender, the second atomic
bomb fell on the city of Nagasaki and also instantly killed 80,000.
The Allies accepted Japan's surrender on August 14,
V-J Day, and on September 2, in Tokyo Bay aboard the U.S.
battleship Missouri, members of the Japanese government
signed articles of unconditional surrender.

Thus ended the most destructive war in history, one that has
changed the face of the modern world. About 50 million people died
during the war, half of them civilians, and the conflict consumed at
least $2 trillion of the world's wealth. Vast stretches of the earth
were devastated, cities lay in rubble, and millions were homeless.
Europe, in ruins, would no longer be the center of global economic,
political, or military power. Japan's empire was destroyed and the
nation humiliated. Nazi death camps and the millions who died in
them revealed the depths of human misery and evil. The
Hiroshima bombing and
Nagasaki bombing
demonstrated the awesome destructive power of
atomic weapons and forever altered calculations about international
relations and military power. The United States and the Soviet
Union, former allies, would soon find themselves pitted against each
other in an increasingly hostile
cold war. Finally, the world faced the monumental task of
rebuilding, recovering, and forging a
new world order.
References:
Stokesbury, James L., Short History of World War II, 1980;
Weinberg, Gerhard L., Germany, Hitler, and World War II,
1995; Zabecki, David, ed., World War II in Europe: An
Encyclopedia, 1999
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