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- 1920 Prince of Wales arrives for New Zealand tour
- 1920 Whanganui mayor shoots poet
- 1920 Fingerprints help convict murderer
- 1920 Alexander Turnbull Library opens
- 1920 New Zealand's first female Olympian
- 1920 First flight across Cook Strait
- 1920 White New Zealand policy introduced
- 1921 New Zealand's first regular airmail service begins
- 1921 First school dental nurses begin training
- 1921 First Rotary club in New Zealand founded
- 1921 Springboks play New Zealand Māori for first time
- 1922 Correspondence School founded
- 1922 New Zealand's first poppy day
- 1922 Catholic Bishop found not guilty of sedition
- 1922 Chatham Islanders vote in first election
- 1923 Death of Katherine Mansfield
- 1923 Forest and Bird founded
- 1923 Baby-farmer Daniel Cooper hanged
- 1923 Main Trunk Line express train disaster
- 1923 Rail tunnel pierces the Southern Alps
- 1923 New Zealand makes claim to Ross Dependency
- 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 Te Haahi Rātana established as church
- 1925 New Zealand and South Seas International Exhibition opens
- 1926 New Zealand Railways Magazine launched
- 1926 Anna Pavlova dances in New Zealand for the first time
- 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 touches down
- 1928 First Bishop of Aotearoa consecrated
- 1928 Luna Park opens in Auckland
- 1929 First 'talkie' draws crowds in Wellington
- 1929 Controversial ex-mayor killed in Berlin riots
- 1929 'Black Saturday' in Samoa