Passage: The United States eventually incorporated the Northern Line into its territories and did the same with the Phoenix Islands which lie between Kiribati and the Line Islands including Howland, Jarvis, and Baker islands, thus, bringing about a territorial dispute. This was eventually resolved and they became part of Kiribati as part of the Treaty of Tarawa. This was signed shortly after independence and ratified in 1983, the United States relinquishing all claims to the sparsely inhabited Phoenix Islands and those of the Line Islands that are part of Kiribati territory.

Question: When was the treaty ratified?
1983