Complete the following. Write the main ideas of the previous text.
During the 17 th......................................................................................................................
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In 18th...................................................................................................................................
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In 1848..................................................................................................................................
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Five years later.......................................................................................................................
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In 1886.................................................................................................................................
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By 1920...............................................................................................................................
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During the 1930's...................................................................................................................
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In the 1950's.........................................................................................................................
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From the 1960's onwards.......................................................................................................
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