My wife and I got married a few years back and the plan was always to get her residency in the US and then citizenship and then move back to her home country. The more I think about it though, the more I don’t want to spend 3-5 years back there. For those who have spouses with citizenship, why did you do it? For those with spouses without citizenship, are there any benefits you’re missing out on based on them not having it?
It is somewhat better than any South American citizenship. At least for now, it might be worse or better in the future, nobody knows. It’s not even that much better for traveling compared to many South American passports, since they have Schengen access and more. Depends which one she has.
Generally speaking, more citizenships are better, but you will have to spend several years in the US, and not all countries allow dual citizenship, so this is something to consider.
Personally, I think it would be more beneficial if you get the citizenship of her country first. As for “emergency plan b” case, I think you both should get a tier-A passport from another country. If you both want to invest so much time and energy into a second passport this would be more advantageous, since residency for a spouse is relatively easy to get anyway, and both of you would get a new citizenship, not just one.
If you are wealthy, there are CBI options for second passports.