The problem is largely down to climate change, mismanagement of water, invasive species, and Conservatives.
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Climate change seems obvious, but trees are generally pretty reliant on having specific temperature ranges, and specific conditions. As climate change gets worse, the more extreme weather events get worse. Extreme conditions can kill trees, evaporate surface water, deprive areas of rain, kill bushes, impact animals etc. Individual trees are decently likely to survive one bad year, but sustained droughts/heat/irregular weather patterns etc can change the surrounding forest, and trees are a lot more the effect of specific forest conditions than the cause.
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Mismanagement of water is obvious, huge amounts of water are being pumped from reservoirs, dropping goundwater levels to the points that trees dont have access. Rivers and lakes are being contained, and not allowed to flood. As previously wet ground dries out (both from lack of rain, and from not having rivers), its profile changes, and the kinds of trees it can support changes. But the kinds of trees that dry ground can support often cant survive the other conditions (elevation, temperature, soil Ph, animals etc).
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Invasive species. Bark Beetles are one of the biggest problems, but spongy moths and other invasive insects are killing trees by the bucketfull. Additionally, invasive species like eucalyptus, palm, and salt-cedar restrict water access, ruin the ground, and choke out native trees. Invasive bushes like tree of heaven, spanish broom, greater periwinkle and giant reed can grow quickly, before dying and drying out during a particularly harsh summer, this dried plant mat makes for fire ladders, easy kindling and massively wildfire risk.
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Conservatives. Conservatives have been pushing to allow private companies and owners to destroy forests, wetlands and other necessary habitat for basically whatever reason. Conservatives push to allow companies like nestle to pump unlimited water from aquafers, and allow AI data centers to take whatever is left. Conservatives have been consistently anti-science and anti-education, and both are needed to restore forests.
The unfortunate reality is that Fascist regimes are inherently unstable, and fascist regimes run by drug fueled narcissist's are the worst of all (in terms of stability).
Since the Neo-Nazi party is in charge in America, the short answer is that its very likely that the US will collapse.
That said, the Roman Empire "collapsed" over the course of several generations (200 to 300 years).
Kinda?
So there is a quote that I think is pertinent here. (Michael Parenti from his book Fascism in a Pinstriped Suit)
"The concentration camp was never the normal condition for the average gentile German. Unless one were Jewish, or poor and unemployed, or of active leftist persuasion or otherwise openly anti-Nazi, Germany from 1933 until well into the war was not a nightmarish place. All the “good Germans” had to do was obey the law, pay their taxes, give their sons to the army, avoid any sign of political heterodoxy, and look the other way when unions were busted and troublesome people disappeared. Since many “middle Americans” already obey the law, pay their taxes, give their sons to the army, are themselves distrustful of political heterodoxy, and applaud when unions are broken and troublesome people are disposed of, they probably could live without too much personal torment in a fascist state — some of them certainly seem eager to do so."
Assuming there is not a massive change in the next election, it seems likely that Fascism will win in America. But as noted above, you can live under fascism for a decent amount of time as long as you keep your head down and dont complain too loudly.
As to this one
Republicans are only some 40% of the population.
There are people out there you can make friends with, who will genuinely care for you, and the manosphere has lowered the bar for men so far that just not being a raging asshole is enough to make you noticeable to women. You dont have to be wealthy to get a girlfriend, im moderately successful (I have a solo apartment, and my car is paid off, but im hardly rich), and I have managed a more or less steady string of girlfriends for the past 10 years or so.
If you can manage to avoid the manosphere, the mens rights people, the redpill idiots and the Christians, you can actually be a decent person, and that's honestly all it takes nowadays. You arent going to jump into bed with a supermodel just being a decent person (probably), but as long as your standards are reasonable, its not that hard to find a relationship (as long as you avoid advice from the above groups).