Impact and Effects of WW1 on America: The effects of WW1 on America were wide-ranging covering the political, economic and social impact of WW1 on the United States.
America had emerged as a world industrial leader and the US economy was booming, profits were increasing which led to the period in American history called the Roaring Twenties with a massive rise in consumerism for the wealthy.
On the negative side, inflation was high and companies and corporations started the reduce wages and lay off workers to keep down operating costs. The power of the Unions had grown during the war, workers protested and 1919 saw a massive wave of strikes. Competition for employment led to racial unrest and race riots breeding hatred and suspicion which spilled over into the Red Scare and the fear of communism. The introduction of Prohibition led to the rise of organized crime, speakeasies, gangsters, increased violence and massive political corruption.
Women's Suffrage: The role of women changed during Great War, and many women took on the jobs of men. The influence and expectations of women and their role in society increased.
Ordinary Americans were building up high debts because of easy credit and started to gamble on the Stock Market, believing it was a 'safe bet'.
In all:
The M.A.I.N. causes of World War I were Militarism, secret Alliances, Imperialism and Nationalism. The driving force was nationalism. ... The igniting incident of the “Great War” was the assassination of the Archduke Franz Ferdinand, heir to the Austro-Hungarian Empire, in Bosnia by a Serbian nationalist.