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- 1920 Whanganui mayor shoots poet
- 1920 Fingerprints help convict murderer
- 1920 First flight across Cook Strait
- 1920 White New Zealand policy introduced
- 1921 NZ’s first regular airmail service begins
- 1921 Springboks play NZ Maoris for first time
- 1922 New Zealand's first poppy day
- 1922 Catholic Bishop found not guilty of sedition
- 1923 Death of Katherine Mansfield
- 1923 Baby-farmer Daniel Cooper hanged
- 1923 Main trunk express train disaster
- 1923 Ōtira rail tunnel opened
- 1923 First Chatham Cup football final
- 1924 Intelligence tests arrive in New Zealand schools
- 1924 'Tom Watson' wins bronze for New Zealand
- 1924 First trans-global radio transmission to London
- 1925 Death of William Massey
- 1925 NZ and South Seas International Exhibition opens
- 1926 NZ Railways Magazine launched
- 1926 Kawarau Falls dam becomes operational
- 1928 Pioneer aviators vanish over the Tasman
- 1928 Kiwi boxer fights for world heavyweight title
- 1928 First trans-Tasman flight
- 1929 First 'talkie' draws huge crowds in Wellington
- 1929 Controversial ex-mayor killed in Berlin riots
- 1929 'Black Saturday' - NZ police open fire in Apia