New Zealand's constitutional structure has evolved from its British colonial roots to a unique system blending Westminster traditions with local innovations. The Treaty of Waitangi, signed in 1840, remains a cornerstone, establishing a partnership between Māori and the Crown. Key elements include an uncodified constitution, a parliamentary democracy with MMP voting, and a constitutional monarchy. The system balances executive, legislative, and judicial powers, while grappling with ongoing debates about Māori rights, republicanism, and civil liberties.