I had thought one of the causes of The Troubles linked to the potato famine and the treatment by the British (or probably more then English) then leading to it.
Saying that, that is what I gathered from the internet. We did not actually learn anything about the history of Northern Ireland/Ireland becoming a republic/the potato famine/The Troubles at school and that was in the 1990s. I was at school when the Good Friday Agreement was signed and still nothing. It wasn't just me though - DH was at a different school a couple of years ahead and said they did not do anything about that. We do know plenty about the Tudors, the American Civil War/Independence, the World Wars and agriculture through the ages though.
As a pp has said, it is a shame that so much of the country's history is not taught in schools and, whilst unsavoury in parts, it is our history and we should know it. It may stop some of the comments I see online about Brexit when people say it could cause a civil war and the reply of 'it isn't the 1800s' (some people on the internet don't even know that) when actually this country's last civil war only ended in 1998.