World War II
World War II
On September 1, 1939, Germany invaded Poland. On September
3 France and England demanded that Germany withdraw its troops.
When Germany refused England and France declared war on
Germany.
Within a week Great Britian was joined in the war by Canada,
Australia, New Zealand, the Union of South Africa, and India. Ireland
was the only member of the British Commonwealth to keep out of the
war.
The start of the war climaxed a series of
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Automatic methods and machinery replaced costly handwork in
countless operations. Machines were developed to squeeze and mold
metal like putty. New alloys and plastics were developed.
Medicine and surgery made great advances. Penicillin might not
have been produced for a generation in normal times. War insecticides
such as DDT began a new age in controlling dangerous pests and
disease carriers. The dangers posed by the use of pesticides would not
be recognized for several years.
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