I am going to point out
William Walker, who, with the backing of merely a company, was able to successful invade and take over Nicaragua, before he was ousted by a coalition of other Latin American nations. Frankly, this demonstrates how easy it would be to invade and take control of one or more Latin American nations.
Yes, I know who Walker is and what a filibuster is. How many of them successfully took over a nation?
Walker, who invaded during a civil war with the full support of one of the sides. That's not going to be a situation that happens consistently. While, sure, you can say "But Latin America has plenty of civil wars!" you're talking about
1) Going against one of the weaker Latin American nations. A filibuster against, for example, Brazil, is not going to work. Really, we're limiting this to just the central American nations or maybe some of the free Caribbean islands (and most of them were still colonies at the time). Most of the South American nations are too large for such a small force to successfully take over.
2) They need the assistance of at least some of the locals. After the first couple of attempts, especially with the memory of Walker, how often do you think locals will be perfectly willing to help a roving band of confederates?
3) Okay, let's assume some filibuster successfully found a weak nation in the middle of a civil war, backed and then turned on one side, and now finds itself in control of a nation. What's stopping other countries from kicking him out? Walker was president of Nicaragua for what, one year? Two? As soon as the CSA or a Confederate supported filibuster takes over a central American nation, the others are going to jump on it. They're smart enough to realize that the Confederates wouldn't just sit tight with their one new territory with no more expansionist ideas.
I'm not talking about Confederate supported filibusters, not a giant mass-mobilization war, just a few filibusters supported by either the Confederate government, or rich slaveholders.
Which would fail.
but you assume that once they left the USA, these expansionist feelings died. I see no evidence to support that idea.
You're mistaken. I was merely pointing out why your reason for belief in Confederate expansionist feeling, the expansion of slavery, is idiotic and requires an incredibly simplistic view of the Confederate mindset.
Plus, there was a lot of
plans,
however unrealistic, for Confederate expansion after the Civil War.
I bolded the important part of that statement.
As your point about USA intevention in such a scenario, I'm skeptical. The CSA will not be 'distracted' in Latin America.
If they actually decide to annex it (you know...
expand) instead of having a friendly filibuster ruler (which also isn't going to happen, anyway, but hypothetically), they're going to
really piss off the neighboring countries. If the US gives them a wink and a nudge, they won't need much to move against Confederate El Salvador, or whatever.
This also assumes that the USA will be looking for a round 2, which is something else that I am not convinced of. Again, it just depends on the exact POD. If it's a long and bloody war ending with the Union political will to fight collapsing, of if it ends with European intervention curb-stomping the USA, then why would the USA be eager for another war?
Because of ideology. Do you think the idea of manifest destiny or American exceptionalism are going to go away? And with manifest destiny and American exceptionalism, don't you think regaining lost territory would be the biggest priority? All that's going to happen is the US will gear up for the next war. The South fought back a lot harder than expected in the Civil War. But with better planning, that would be completely negated,
especially as the Confederates stagnate and fall into poverty.
History is full of nations who lost a war trying again. Best example is Germany during the World Wars.
In a settled peace:
The Republicans are going to be just as eager to to retake lost Confederate lands. They'd blame the Democrats for declaring peace in a winnable war. Buff up military, and look for any excuse to fight. With a better prepared military geared specifically to fight the Confederates, and without the confusion as half the command structure suddenly switches sides, it's unlikely to go as it did the first time around, especially with an ally in Mexico or a central American coalition.
The Democrats, meanwhile, will not strictly be pro-Confederacy. Perhaps you'll see some pro-Confederate individuals in the southern midwest, but when most Americans want more territory, and a good faction of those Americans want
Confederate territory, it'll be difficult to ignore a good opportunity for them to declare war.
In a European curb-stomp peace:
Europe isn't going to assist the Confederates in a war of aggression. That's pretty clear. So, America is going to have a green light to invade as soon as Confederate soldiers cross a border. It's pretty much as simple as that.