The United States and New Zealand established close ties in 1942, when the U.S. provided security for New Zealand during World War II, and have remained close ever since. However, in 1984, the Labour party came into power in New Zealand, with intentions to bar nuclear-armed and nuclear-powered warships from New Zealand ports. Implementation of this anti-nuclear policy was incompatible with U.S. policy and disrupted the alliance under the Australian, New Zealand, and United States (ANZUS) security treaty of 1951. After unsuccessful attempts to remedy the issue, the United States suspended its ANZUS security obligation to