I had a few questions. During The Troubles, Sinn Fein were often mentioned in the press as the political wing of the IRA, but it was more nuanced than that, wasn’t it? If I remember correctly, Sinn Fein predate the IRA by quite a bit, or is my age catching up with me? Also weren’t they at the forefront of the independence movement? So how did they end up being supplanted by Fiana Fail and Fine Gael?
Firstly, your knowledge is quite impressive, where'd you get it? You know more than many here haha.
Robert's given an excellent summary but here's the jist.
Sinn Fein were founded by Arthur Griffith (big trade unionist) in the early 20th century off the back of the revival of Gaelic culture movements that sprang up at the end of the 19th century, the most notable of which would be the GAA (by far the biggest sporting organisation in Ireland). There was a cultural shift in this time as Ireland basically began to properly resent the colonial culture planted here and began promoting and raising awareness of our indigenous culture. SF basically grew from this cultural shift as a pro independence party.
As Robert said, in the final Westminster elections held here Sinn Fein romped home and took nearly all of the Irish seats. They adopted an abstentionist policy i.e refused to recognise the Westminster government therefore refused to take their seats. They formed a breakaway Government, Dail Eireann. The War for Independence broke out not long after, and SF and the IRA naturally fought for independence, although I believe the IRA and SF remained distinct eintities at this time, albeit very closely linked with many dual members.
The War eventually ended in whats known as the Anglo Irish Treaty, whereby the Republic as it is today won Dominion status in the Commonwealth and the right to self govern in many areas, including crucially in defence. The downside to this however is that this treaty is what partitioned Ireland, as the North did not want to break away from its current union with the UK in any form, hence partition occurred, whereby the 26 counties got their limited self governance in Dublin under Dail Eireann, whereas the Unionists got Stormont Parliament.
This caused severe tension and ultimately a split in Sinn Fein. This split the party into two factions. Sinn Fein who were pro Treaty (i.e the compromise of partition was worth the sacrifice of the North as the IRA could never win a full war vs the UK, in fact even getting the Treaty was a massive diplomatic victory) and the anti Treatu Fianna Fail (either all of Ireland broke off or nothing, didnt want to accept partition and viewed it as a sellout to the UK).
Ironically enough it was Fianna Fail who would go on to dominate a partitioned Ireland while Sinn Fein quickly fell into obscurity outside of NI and regularly polled only 3-5 percent in the Republic up to the turn of the millenium. SF did eventually morph into being the political wing of the Provisional IRA, and in fact many Provo's are no doubt still heavily involved. So SF do not really predate the original IRA who fought the independence war, but they do predate the Provisional IRA who were founded in the late sixties, who they essentially became the political wing of, releasing statements and the like. The running gag in Irish politics is to repeat that Gerry Adams was never in the PIRA, as he was never legally convicted of, despite the fact that he was its literal leader for about three decades lol.
Your confusion there likely arises due to the PIRA being generally called the IRA, despite them technically being seperate groups. Lets not even get into Continuity IRA, Real IRA lol, it's a bit like a supermarket shelf just with guns.
Fine Gael are a seperate entity entirely, they represented large farmers traditonally and aren't related to SF in any real way. Originally Cumann na NGaedhael, they held power in the 1920's post civil war before They rebranding as a far right movement under Eoin O'Duffy bafflingly enough, blueshirt uniform and salute gestures and everything. Hell they even fought for Franco in the Spanish Civil War. They were always very fringe up until post WW2 when they took their current stance of centre right and became unrecognisable from its roots and history which they, unsurprisingly, tend to keep quiet.
The main reason I can vaguely recall why SF became an irrelevance outside NI for so long and so soon is that FF basically copied their election strategies and political vote winning moves to a tee i.e strong parish based political structure, heavily local focused and a more than small dose of you scratch my back I scratch yours. FF also from its foundation also had many of the most popular members of SF from its outset, so although there was a general feeling of annoyance at them causing a Civil War, they were still seen as being "pro Irish patriots" in lieu of another term.