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The KKK was re-spawned after the war and picked up a large amount of popularity. Clan activity was increasingly popular with white american protestants who were displeased at americas assimilation with african americans and all other immigrants.
https://www.khanacademy.org/humanities/ap-us-history/period-7/apush-1920s-america/a/the-reemergence-of-the-kkk

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https://www.newamerica.org/oti/policy-papers/radio-
revolution/

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Americans became increasingly nativist and isolationist in the 1920's. American started funneling immigration completely prohibiting immigration from countries like japan and only allowing protestant white northern european move to America. This was part of the Immigration Act of 1924.
https://history.state.gov/milestones/1921-1936/immigration-act

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https://prezi.com/edggvugyl8mu/hollywoods-filmland-fantasies/

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http://apushwithmaria.blogspot.com/2011/03/dynamic-decade.html

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Guglielmo Marconi, an Italian, invented wireless telegraphy in the 1890s, which was used for long-
range communication during World War I.

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There was mass hysteria coming into the 1920 because the Bolshevik Revolution in Russia was seen as the first step to a worldwide communist takeover. This led to the big Red Scare(extreme anti-communism movement) in the early 1920s and the Palmer Raids which put away many who were suspected communist and limited the rights of people.
http://www.mass.gov/courts/court-info/sjc/edu-res-center/saco-vanz/the-red-scare-of-1919-1920-4-gen.html

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The prohibition lead to great increase in crime because of the illegal business surrounding alcohol. Violence and gangs spawned in immigrant neighborhoods, rival gangs battled for bootlegging turf using gun violence. Gangster then moved on to other more profitable such as prostitution, gambling, and narcotics. In the 1930 criminal wealth was estimated to be around 12 to 18 billion dollars
https://topdocumentaryfilms.com/hidden-secrets-gangsters-1920s-1930s/

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The radio made a huge contribution educationally, politically, culturally. It also further stimulated sports and music. Also it spread the news.

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http://www.apnotes.net/notes-15e/ch31-15e.html

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More and more kids were going to school, about one out of four graduated high school

Professor John Dewey set the principles of Learning by doing. He felt that teachers should educate students about things they needed for life. Science and healthcare improved

Teaching Darwinism evolution was destroying religion
http://www.dewey.pragmatism.org/

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John Dewey (1859-1952) was an American psychologist, philosopher, educator, social critic and political activist. He was born in Burlington, Vermont, on 20 October 1859. Dewey graduated from the University of Vermont in 1879, and received his PhD from Johns Hopkins University in 1884.

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WW1 and treasury secretary Andrew Mellon's tax policies brought prosperity to mid- 1920s

Advertising was founded

Sports became a big business

Buying in credit was also new

Personal debt became more common
http://www.american-historama.org/1913-1928-ww1-prohibition-era/mellon-plan.htm

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Automobiles became more popular in the 20s

Created new mass production techniques

Detroit became the car capital of the world

Henry Ford created the model T and by the 30s more than 20 million people had them.
http://www.history.com/topics/model-t

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Automobile industry created millions of jobs

Americas living standard improved

Railroad industry declined

Petroleum industry grew

Automobiles allowed suburbs to spread out, but it also cause millions of deaths
http://l3d.cs.colorado.edu/systems/agentsheets/New-Vista/automobile/

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Gasoline engines led to the invention of airplanes

After the success of planes in WW1 private industries began to make planes

Charles Lindberg was the first man to fly across the Atlantic Ocean in 1927
http://www.charleslindbergh.com/history/

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Many woman and Southerners supported the Abolition of Alcohol and demanded a decrease in Bootlegging. Now matter how extreme prohibitionists were they were naive to the fact the government could not regulate its people's thirst.
http://www.history.com/topics/prohibition

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Hollywood, quickly became
the movie capital of the world.
Early producers featured nudity and heavy-lidded female vampires , and an offended public forced the screen magnates to set up their own rigorous code of censorship.

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During this decade, they found that Americans no longer lived
in the countryside but in urban areas. For them it was better to find employment in the cities, women though tended to cluster in a few low-paying jobs (such as
retail clerking and office typing) that became classified as “women’s work.”

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During this time a new generation of writers and artists burst upon the scene. Many of them hailed from ethnic and regional backgrounds different from that of the Protestant New Englanders who traditionally had dominated American cultural life. The newcomers exhibited the energy of youth, the ambition of excluded outsiders, and in many cases the smoldering resentment of ideals betrayed.

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http://www.apnotes.net/notes-15e/ch31-15e.html

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All the activity going on Wall street caused the stock market to rise and everyone could borrow money very easily and they thought it was great until they realize it could later crash