Keywords: Canals USA 1825.png Canals in the United States about 1825 Johnson Allen 1915 Union and Democracy Cambridge Massachusetts Houghton Mifflin Company 1915 Allen Johnson PD-old Check categories 2008 November 11 en wikipedia Canal en wikipedia List_of_canals_in_the_United_States en wikipedia Technological_and_industrial_history_of_the_United_States en wikipedia Trade_route en wikipedia History_of_turnpikes_and_canals_in_the_United_States ja wikipedia アメリカ合衆国の 術と産業の歴史 Canal canal Industrial history United States North America - Norteamérica History of science Revolutions History of the United States History of social movements Economy of the United States Science and technology in the United States Canals in the United States Industrial revolution History of technology |