Those who favored American imperial expansion in the late 19th and early 20th century believed it would provide bases for the U.S. Navy.
Because Britain and the U.S. were opposed to outright colonization.
Science and theory in the early 20th century?.
I am pretty sure that it is the early 20th century
France had vietnam as a colony through half of the 20th century because they wanted another country helping them during the war
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)
20th century
In the early 20th century.
Look at an early 20th century map. Austria and Germany are in the center of Europe.