Part of the Dieselpunk genre which continues to at least the end of WWII
- 1921: Red Army invasion of Georgia; United States formally ends WWI; Miss America Pageant held; The World Series is first broadcast on radio; Japanese Prime Minister Hara Takashi is assassinated
- 1922: Ulysses published; Benito Mussolini becomes Prime Minister of Italy.
Ottoman Empire is abolished
- 1923: Rosewood massacre;
- 1924: Surrealist Manifesto published; Julius Edgar Lilienfeld patents the field-effect transistor.
- 1925: Mein Kampf, The Great Gatsby, Manhattan Transfer, The Making of Americans, Mrs. Dalloway, Emily Dickinson’s Complete Poems published; Scopes Monkey Trial; Paul von Hindenburg elected president of Germany
- 1926: The Sun Also Rises, Les Faux-Monnayeurs, Ivan Pavlov's Conditioned Reflexes, The Weary Blues, The Seven Pillars of Wisdom, Winnie the Pooh published; Harry Houdini dies; first 16-millimeter movie film produced; Germany joins League of Nations; Spain resigns membership
- 1927: The Jazz Singer released; Spirit of St. Louis flight; CBS founded; Great Mississippi Flood of 1927
- 1928: The Passion of Joan of Arc; penicillin formally discovered; Stock market breaks and falls twice (June and December)
- 1929: Wall Street Crash of 1929
- 1930: Boulder Dam construction begins; Chrysler Building finished