Since I was a child I wondered why is Ireland not part of the U.K. or why are there two Irelands, but since I am from latinamerica none of my questions were answered at school (since it had nothing to do with the history of my country).
I've seen many memes and jokes about Ireland hating Northern Ireland and vice versa, so I was curious of why.
Ok, extremely complicated question but start about 350 years back with this reddit post from ask historians and it doesn't get much prettier from there
Check other posts on the irish potato famine and 1918 and you will get a feel why they are not keen to join the UK
Edit and my apologies credit to u/rimbaud82
You should look at these answers by u/maniacalbrain and u/irishhistoryguy
https://www.reddit.com/r/AskHistorians/comments/bena3a/comment/elciicw
https://www.reddit.com/r/AskHistorians/comments/5kdisi/comment/dbn7yvn
And here are some recent answers by u/Rimbaud82 and u/crossbowthemessenger
https://www.reddit.com/r/AskHistorians/comments/ncj6i6/comment/gy6tavw