The last time: countries and borders

8 closed last occurrences in countries and borders, most recent first.

Question	When	What	Could it change?
When did a country last join the United Nations?	14 July 2011	South Sudan, the 193rd member	Yes
When was the US Constitution last amended?	7 May 1992	The 27th Amendment, on congressional pay	Yes
When did Britain last change its currency system?	15 February 1971	Decimal Day, when the pound went from 240 pence to 100	No
When did the US flag last change?	4 July 1960	The fiftieth star was added for Hawaii	No
When was a US state last admitted?	21 August 1959	Hawaii, the fiftieth	Yes
When did a European country last change calendar?	1923	Greece adopted the Gregorian calendar, the last in Europe to do so	No
When did the size of the US Supreme Court last change?	1869	Fixed at nine justices by the Judiciary Act	Yes
When did the Union Jack last change?	1 January 1801	St Patrick's saltire was added for the union with Ireland	No

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