When did Ireland leave the UK?

Related questions

1. Can I go to Dublin with a UK visa?
2. What did Ireland do in World War 2?
3. Why is southern Ireland not part of UK?
4. Do Irish citizens have indefinite leave to remain in the UK?
5. Was Ireland attacked in ww2?
6. Can I travel to Ireland with UK residence permit?
7. Did Ireland fight in ww2?
8. Why did Ireland not fight in ww2?
9. Was Ireland a British colony?
10. What is the peak tourist season in Ireland?

Tags

1. #ireland
2. #treaty
3. #become
4. #kingdom
5. #state
6. #creating
7. #known
8. #anglo
9. #northern
10. #within
11. #remained
12. #irish
13. #under
14. #seceded
15. #united
16. #counties
17. #partition
18. #after
19. #independence
20. #independent
21. #northeastern