What makes you say this?
Well, I live in the region and I look around.
I am not dismissing the potential for LatAm or the Global South to move away from the West. If anything I'm a bloomer about it: because I recognize that the pragmatic game is a requirement for that to happen, and I think most governments in the region are well poised to play it. As despairing as it will be to watch Trump collapse the world's economy over 'trade imbalances' its a good thing that China's influence is strong enough that even with American boots on Peruvian soil the megaport and the rail projects are still going ahead. Or that even a dumbass like Milei can't pretend he'll export soybeans to the US for a living.
At the end of the day the single most successful example of building an alternative to the West is China. It was not built via a revolution that turned China away from the West. Far from it. Even now the Chinese would have to be pushed kicking and screaming away from their trade surpluses, ability to recycle those surpluses into foreign assets and projects, not to mention massive possibly even under-reported foreign currency reserves. Even Russia, the designated enemy of the past 20 years, had to be driven to a corner.
Let's say the US declines. Hard. And becomes as much a Great Power as, say, Russia.
Isn't the Ukraine War a pretty good example of the limits of that risk taking? How about a war over Taiwan? These are disastrous scenarios and we are assuming that the US isn't in charge of the global finance.
I wouldn't be dismissed if I was another american here, claiming that the US has a massive, reactionary right wing constituency that is only (slightly) outnumbered by another massive, liberal and also right wing constituency. And yet because I'm from Latin America and if I make a similar claim I'm a reactionary? Hell, my outlook is that only half of the region is deeply right wing. This means I have a more positive opinion on latin america than any american leftist has on the USA population. And yet that's enough to be outright dismissed. Sorry but if you're Latin American, I'd call you naive. If you're American, I perceive your position as deeply patronizing.
You can point to México, where a successful developmentist programme bends the opinions of the right wing because it delivers material gains for everyone. Brazil surfed a similar wave not too long ago. These scenarios do not mean that the right wing does not exist. They do not mean that evangelical churches aren't a fulcrum of power. They do not mean that a 500 year old oligarchy does not own these countries. They do not mean that the legacy of US dictatorships and propaganda don't exist. What they mean is that latin americans are as human as everyone else, and as contradictory as everyone else.
That's just not true. Not only is the neopentecostal movement much, much bigger than you think, its propaganda efforts are hegemonic and affect - for better and worse - the conduct of catholic and historical protestant groups as well.
I'd be careful about decades, because if your analysis veers towards half a century of history you'll find yourself in the terrain of progressive reforms by latin american general-dictators who were ok with divorce because they were raised Lutheran and hated the catholic church. Latin America as a region is not one where revolution has reigned supreme, but rather where relative progressivism has made waves following the gato pardo principle. 'Let us do the revolution so that adventurers don't take the initiative', or, rather, let us change so that things stay the same.
The long arc of history bends progressive because, eventually, all these resource economies go through the cycles of boom and bust and in order to avoid collapse end up reforming in a number of ways. A century ago it was the benefit of urban workers to the detriment of the peasant majority. Twenty years ago it was an effort to follow IMF dictats to increase consumption. Either way, the more we discuss the issue the more reasons come up as to why Latin America cannot and is probably better off not being revolutionary in the medium term, much less the short term.