Dominion / modern New Zealand
Who & why: the Southern Cross ensign, flown informally for decades, is fixed as New Zealand's own national flag by the New Zealand Ensign Flag Act 1902. Five years later, on 26 September 1907, New Zealand is proclaimed a self-governing Dominion within the British Empire, formalizing an autonomy it had exercised in practice for years. Full practical sovereignty follows gradually across the mid-20th century, marked in law when New Zealand adopts the Statute of Westminster in 1947.
What it represents: the Union Jack in the canton records the constitutional link to Britain that shaped New Zealand's founding institutions; the four red, white-bordered stars of the Southern Cross on the fly mark the country's place in the southern hemisphere, echoing the same constellation flown by several of its Pacific neighbors while remaining distinctly New Zealand's own arrangement and colors.
Wikipedia's infobox gives the adoption as 24 March 1902; Flags of the World dates it 12 June 1902. Flags of the World's history pages (David Prothero, from Admiralty and Gazette sources) reconcile the two: the New Zealand Ensign Act 1901 received royal assent on 24 March 1902 and the proclamation was published in the New Zealand Gazette on 12 June 1902, making the Blue Ensign with four red white-bordered stars the national flag.
- Flag of New Zealand — Wikipedia compiled
- New Zealand — Flags of the World (CRW Flags) compiled
- Historical flags of New Zealand: Origins of the New Zealand Flag (1840-1898) — Flags of the World (CRW Flags) compiled
- Historical flags of New Zealand: Origins of the New Zealand Flag (1898-1903) — Flags of the World (CRW Flags) compiled
Not established: The design and colours were not checked against a specification. The page's wording on the Union Jack and the Southern Cross meaning is its own and was not tested.