---
title: "The last time — countries and borders"
description: "8 things in countries and borders that happened once and have not happened since, with the date and what actually took place."
url: https://atoneplace.net/the-last-time/nations/
site: "At One Place"
---

# 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 |

- [When did a country last join the United Nations?](https://atoneplace.net/the-last-time/un-member/) — 14 July 2011
- [When was the US Constitution last amended?](https://atoneplace.net/the-last-time/constitutional-amendment/) — 7 May 1992
- [When did Britain last change its currency system?](https://atoneplace.net/the-last-time/decimal-currency-uk/) — 15 February 1971
- [When did the US flag last change?](https://atoneplace.net/the-last-time/us-flag-change/) — 4 July 1960
- [When was a US state last admitted?](https://atoneplace.net/the-last-time/us-state/) — 21 August 1959
- [When did a European country last change calendar?](https://atoneplace.net/the-last-time/calendar-change/) — 1923
- [When did the size of the US Supreme Court last change?](https://atoneplace.net/the-last-time/us-supreme-court-size/) — 1869
- [When did the Union Jack last change?](https://atoneplace.net/the-last-time/uk-flag-change/) — 1 January 1801

## Related pages

- [Space](https://atoneplace.net/the-last-time/space/)
- [Science and measurement](https://atoneplace.net/the-last-time/science/)
- [Technology that stopped](https://atoneplace.net/the-last-time/technology/)
- [The natural world](https://atoneplace.net/the-last-time/nature/)
- [Everyday things](https://atoneplace.net/the-last-time/everyday/)