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The cotton gin, invented by Eli Whitney, revolutionized slave-based agriculture in the Southern United States.. The technological and industrial history of the United States describes the emergence of the United States as one of the most technologically advanced nations in the world in the 19th and 20th centuries.
The rise of fascism and Nazism in the 1920s and 30s led many European scientists, such as Albert Einstein, Enrico Fermi, and John von Neumann, to immigrate to the United States. [22] An American invention that was barely noticed in 1947 went on to usher in the Information Age.
The 1920s saw dramatic innovations in American political campaign techniques, based especially on new advertising methods that had worked so well selling war bonds during World War I. Governor James M. Cox of Ohio, the Democratic Party candidate, made a whirlwind campaign that took him to rallies, train station speeches, and formal addresses ...
The 1920s (pronounced "nineteen-twenties" often shortened to the "' 20s" or the "Twenties") was a decade that began on January 1, 1920, and ended on December 31, 1929. . Primarily known for the economic boom that occurred in the Western World following the end of World War I (1914–1918), the decade is frequently referred to as the "Roaring Twenties" or the "Jazz Age" in America and Western ...
The most common type in daily use is disposable and designed to be inserted into the vagina during menstruation to absorb the flow of blood. The ancient Egyptians first invented disposable tampons made of softened papyrus around 2500 B.C. The ancient Greeks followed this with tampons made from lint wrapped around a small piece of wood.
The 1920s (pronounced "nineteen-twenties" often shortened to the "' 20s" or the "Twenties") was a decade that began on January 1, 1920, and ended on December 31, 1929. . Primarily known for the economic boom that occurred in the Western World following the end of World War I (1914–1918), the decade is frequently referred to as the "Roaring Twenties" or the "Jazz Age" in America and Western ...
1920s: Culture Wars. As European economies recovered and the USA boomed in the wake of World War I, the number of Americans living in cities exceeded the number on farms for the first time.
The economic history of the United States spans the colonial era through the 21st century. The initial settlements depended on agriculture and hunting/trapping, later adding international trade, manufacturing, and finally, services, to the point where agriculture represented less than 2% of GDP.