Template:Encyclopedia Westarctica:This month in history/December
- 1 December - The Antarctic Treaty is signed by the United States. (1959)
- 05 December - The Achaean Royal Charter is decreed by the Consul-General. (2002)
- 05 December - Westarctica is incorporated as a non-profit corporation in the state of California. (2014)
- 28 December - Grand Duke Travis marries Prince-Consort Dinny in a civil ceremony (pictured) in Los Angeles, California. (2016)