Why did migration from Pacific islands to New Zealand grow after the 1950s?

Since the 1950s, migration from Pacific islands—specifically Samoa, the Cook Islands, Niue, and Tokelau—to New Zealand has grown significantly.1

This trend is largely linked to the evolving political and constitutional relationships between New Zealand and these territories. Following World War II, New Zealand moved toward granting these islands greater autonomy, eventually establishing frameworks where nations like the Cook Islands and Niue entered into free association with New Zealand. These arrangements often provided residents with New Zealand citizenship, which facilitated movement between the islands and the mainland.23

Additionally, immigration patterns in New Zealand have historically been sensitive to the country's economic conditions and employment opportunities. As New Zealand developed a more varied industrial sector in the postwar decades, it attracted labor from the Pacific, contributing to the growth of these communities within the country.415