20th century Year Date Event 1918  George Tupou II died and was succeeded by Queen Sālote Tupou III.  1965  Sālote Tupou died and was succeeded by King Tāufaʻāhau Tupou IV.  1970  Tonga regained full sovereignty and independence from the United Kingdom and joined the Commonwealth of Nations.  1999  Tonga joined the United Nations.
20th century | class="wikitable" width="100\%" ! style="width:6\%" | Year || style="width:10\%" | Date || Event |- | 1918 || || George Tupou II died and was succeeded by Queen Sālote Tupou III. |- | 1965 || || Sālote Tupou died and was succeeded by King Tāufaʻāhau Tupou IV. |- | 1970 || || Tonga regained full sovereignty and independence from the United Kingdom and joined the Commonwealth of Nations. |- | 1999 || || Tonga joined the Uni
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United Nations.
Uni