- The flu epidemic continues from the late 1910s.
- In 1922 the discovery of the remarkably preserved tomb of King Tutankhamen of Egypt by Howard Carter sparked a worldwide interest in archaeology and a race for discovering the lost treasures of Egypt.
- In 1923, the Great Kanto Earthquake struck Japan and hugely shook up the flow of events of the country, as Britain poured millions of pounds of aid into rebuilding the devastated country, however they were forced to cut ties with Japan by the United States, which indirectly led to the Second Sino-Japanese War some 15 years later as Japan began on a path of imperialism and militarism to feed its starving populace and expand its territory.
- In 1929 the United States experienced such a horrible stock market it affected the worldwide flow of the economy, plunging the US into The Great Depression.
- Television was in fact invented this decade, and the first image broadcast was a short moving image of Felix the Cat.
- The BBC began broadcasting radio service.
- The Scopes Trial occurred, in which John T. Scopes was fined 100 dollars for teaching evolution.
- The B.F Goodrich company invents rubber.
- This was the era of the musical and musical theater, as well as when jazz was popularized, and many famed stars rose this decade, including Al Jolson, Louis Armstrong and Duke Ellington.
- In 1928 Steamboat Willie, the first cartoon with synchronized sound, not the first cartoon starring Mickey Mouse, was debuted, to much fanfare and launched The Golden Age of Animation.
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