In this decade, some barriers break down, some seeds of war are planted, and technology in the fields of communication, health, aviation and rocket science has increasing influence. Economic crises also loom large.
1920
• League of Nations created.
1921
• Swedish women given the right to vote.
1922
• British Broadcasting Company founded (changed to British Broadcasting Corporation in 1927)
1924
• Greece becomes a republic.
• Compulsory voting introduced for federal elections in Australia.
• Adolf Hitler writes Mein Kampf in prison.
• Danish explorer Knud Rasmussen completes what was then the longest dog-sled journey across the North American Arctic.
1926
• Robert Goddard launches first liquid-propelled rocket.
1927
• Charles Lindbergh becomes first man to fly solo nonstop from New York to Paris.
1928
• Alexander Fleming discovers penicillin.
1929
• United States stock market crashes; economy begins to slide.
1930
• World depression deepens.
• Scandinavian edition of the Herald is issued.
• Frank Whittle patents first jet engine.
