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farm production declined significantly
Population in slums increased
Two big events in other countries that prompted people to move to US in the late 19th and early 20th century was war and poverty.
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I am pretty sure that it is the early 20th century
Science and theory in the early 20th century?.
William Hoover invented the vacuum cleaner in the early 20th century.
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The Steamboat
Radio was not an important invention in the early 20th century. Instead it was developed by Heinrich Hertz in the 18th century. The cotton gin (APEX)
In the early 20th century.
warren
Chad, Niger, Mali, and Mauritania were know as the French Sahel in the early 20th century
Chad, Niger, Mali, and Mauritania were know as the French Sahel in the early 20th century
German immigration to the USA occurred in several waves but was particularly significant in the 19th century, with large numbers arriving in the mid-1800s due to economic hardship and political turmoil in Germany. This immigration continued gradually into the early 20th century before declining significantly with the outbreak of World War I.
Early 20th Century