Why were many New Zealand Company land purchases later ruled invalid?

Many land purchases made by the New Zealand Company were ruled invalid because they were conducted with haste and often involved unethical practices, including trickery and brutality, to secure claims before British annexation.12

The company’s agents frequently failed to identify the true Māori owners of the land. This process was inherently complex because Māori land ownership was communal, and traditional titles had been significantly disrupted by decades of warfare. Furthermore, the Treaty of Waitangi, signed in 1840, established that Māori would sell land only to the British Crown, which necessitated a formal government review of all prior private transactions to ensure fair dealing.21

The British government held a strong moral obligation to act as a guardian of the Māori people, and the subsequent investigations into these transactions revealed that the company had often claimed land that was not legitimately available for settlement.12