The airplane had been invented only 11
years before the war began. At first Germany
used floating aircraft called zeppelins,
rather than airplanes, to bomb the
United Kingdom. Then the British built
antiaircraft guns to shoot down the zeppelins.
During the war both sides built several
kinds of warplanes. Fighter airplanes had
machine guns to shoot at other airplanes.
In 1917 the Germans started
dropping bombs from airplanes. In the
United Kingdom these bombings killed
about 1,300 people and injured about
3,000.
Events of 1917
The Russian Revolution in 1917
changed the Eastern Front. A group
called the Bolsheviks took over Russia in
November. They made peace with the
Central Powers almost immediately. The
Germans were then able to move their
troops elsewhere.
Meanwhile, the United States entered
the war on the side of the Allies. President
WoodrowWilson at first did not
want to go to war. He changed his mind
because Germany kept attacking U.S.
supply ships. The United States also
found out that Germany had promised
to give Texas, New Mexico, and Arizona
to Mexico in return for Mexico’s help in
the war. The United States declared war
on Germany on April 6, 1917.
The Tide Turns
During the winter of 1917–18, there
were more German soldiers than Allied
soldiers on the Western Front. In 1918
the situation changed, as nearly 10,000
U.S. troops landed each day in France.
By November, the Allies had driven
back the Germans to the battle lines of
1914.
The Central Powers started surrendering.
The Bulgarians gave up on September
29, 1918. On October 30 the
Austrians asked for a cease-fire (an end
to fighting). The Ottomans gave up on
the same day.
By this time, the German people were
starving. The naval blockade was keeping
food shipments from reaching the
country. On November 11, 1918, Ger-
Fighter pilots got into battles called dogfights
as they tried to shoot each other down.
64 World War I BRITANNICA STUDENT ENCYCLOPEDIA
man government leaders signed an
armistice—an agreement that ended the
fighting.
The Peace
The Allies met in January 1919 and
wrote a document called a peace treaty.
The treaty allowed Germany to keep
only a small army and navy. Germany
was also forced to pay a large amount of
money to the Allies. In addition, the
treaty started the League of Nations, an
organization that was supposed to prevent
future wars.
German and Allied representatives
signed the Treaty of Versailles on June
28, 1919. (Versailles is a town near Paris,
France.) Separate treaties made peace
with Austria, Bulgaria, and the Ottoman
Empire. However, the U.S. Senate
refused to ratify, or agree to, the Treaty
of Versailles. Some senators were against
the treaty because they did not like the
League of Nations.
The Allies’ dreams of peace did not last
long. The German people did not like
being punished. They brought Adolf
Hitler to power in 1933. He built up the
German military and started to conquer
neighboring countries. The League of
Nations could not stop him. His actions
led toWorldWar II.
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WorldWar II
World War II started in 1939. By the
time it ended in 1945, the war involved
nearly every part of the world. The two
sides that fought the war were called
the Axis powers and the Allies.
Germany, Italy, and Japan were the
major Axis powers. The major Allies
were the United States, the Soviet
Union, the United Kingdom (Great
Britain), and France. China also aided
the Allies.
More people died in World War II than
in any other war. Experts guess that 40
to 50 million people lost their lives.
Many were civilians (people not
fighting the war). About 6 million were
victims of the Holocaust—a German
plan to kill people that they thought
were inferior.
Events Leading toWar
Japan, Italy, and Germany all committed
warlike acts in the 1930s. In 1931 Japan
began an invasion of China. Italy, led by
Benito Mussolini’s Fascist Party, conquered
the East African country of
Ethiopia in 1935.
Germany was the biggest threat to world
peace. Adolf Hitler and his National
Socialist, or Nazi, Party wanted Germans
to rule over everyone else. In
March 1938 German troops marched
into Austria.
Hitler next wanted a part of Czechoslovakia
where German-speaking people
lived. Great Britain and France agreed to
let him have it. They hoped to satisfy
Only a few
countries,
including
Spain, Switzerland,
and
Sweden, were
neutral in both
world wars.
Neutral means
that they did
not take sides.
BRITANNICA STUDENT ENCYCLOPEDIA World War II 65
Hitler so that he would make no more
demands. Their plan—called
appeasement—was a failure.Within six
months Germany took control of all of
Czechoslovakia.
Hitler then planned to take over Poland.
Britain and France promised to help
Poland in case Germany attacked it.
Germany prepared for war by making
peace with the Soviet Union (which was
not yet on the Allies’ side) in August
1939. Germany did not want to fight
Britain, France, and the Soviet Union all
at the same time.
War with Germany Begins