Off the top of my head, 3 Mt. Shasta incursions that did not end well. (Never does when you mess with a great Dragon!).
It's 2053. So situation described in "Tir Tairngire" happens after war for Shasta Dam.
But thing is... well. If all that factors can put a depopulation such as Detroit's one (even if we waive out that city depopulation has very different mechanisms as country depopulation), that's a kind of civil war there. Something near Syrian civil war. But every source about fighting with Rinelle ke’Tesrae says about "hundreds of arrests and some deaths". It's not a civil war.
Also I'm not so sure about much higher living standard. Tir living standards in 2062 (and it's definitly said it's fallen a lot!) are: 25 000 nuyen per capita, 26% povetry, 8% SINless (just in case - it's number of people who haven't any civil rights/privilegies), 94% educated population (more than 12 years).
CalFree have little better income per capita (28 000), but same level of povetry (27%), 32% SINless and 66% education level. Oh yeah, and it's war there.
Siux are something better with depressed Tir - 22 500 nuyen per capita, 21% povetry, 15% SINless and 92% education level.
Salish-Sidhe - 26 000 nuyen per capita, 20% povetry, 15% SINless, 93% education level.
UCAS - 28 000 nuyen per capita, 26% povetry, 30% SINless (yeah, 30% of UCAS population haven't any civil rights; when you notice it, a noble indignation mostly-UCAS-based shadowtalk gives about Tir's despoty seems kinda amusing), 83% education level.
So, highly depressed Tir became with the same living standard as his neighbourhood on it's lowest point. Where all that residents who can't find a job go, where can they take a better life (it's mostly elves, I should notice)? In Tsimshian or elven ghetto of Seattle?
And this leaves simple question. Yeah, states can fall, I know it. But how that low-level magically became this: "as you all know, the Tír now boasts the fastest growing economy in North America. Even more important, repeated surveys show that Tír citizens consider their nation to be “stable, prosperous, full of opportunities, and a place where metahumans and nature live in harmony.” Outside the Tír, the country is a top-ranked tourist destination (and tourist nuyen has been a huge part in restoring the country’s economy) and several of the cities, such as Portland, Salem, and Bend have held “best places to live in North America” titles for several years running now."
Take your Detroit example - that city is bankrupt. That's kind of normal. Tir isn't bankrupt, quite the opposite.
Is magical power of representative democracy WITHOUT social reform (Tir classes stays, Tir bias against non-elves stays, Tir nobles retain their money) did it? There is assumptions that some AAA-corps (as Horizon) put their money into Tir to make it more corp-friendly - well, Tir didn't even sign Business Recognition Accords.