Yesterday Northern Irelands terror thread level was decreased for the first time in 12 years, yet the threat is still counted as substantial. What lead up to the IRA and all the violence seen in the last part of the 20th century in Northern Ireland, and what did they do?

by Lukas2811_

https://www.google.com/amp/s/news.sky.com/story/amp/northern-ireland-terror-threat-level-lowered-for-first-time-in-12-years-12572654

Rimbaud82

In terms of what lead up to the IRA you might find these follow-up answers of interest. The main thread is about the period of the Irish War of Independence, but the follow-ups touch on the more recent history:

Brief account of the history of the various groups known as the IRA

Some general points about The Troubles

If there is something more specific you want to ask about then feel free, I will try to answer and I know there are some flairs on here with more direct specialty in that area.