> This feels like it has to be a federal matter. It's impossible to imagine every state picking & choosing how it runs it's own international diplomatic ties.

I'd think so too - but apparently not: https://en.wikipedia.org/wiki/Property_law_in_the_United_Sta...

It seems that property is mostly a state thing, but it's certainly interesting that it has international effects and an impact on the US' reputation nationally.

> It would be too cruel to make the US into 50 different states everyone has to bargain with.

I'm trying to think of the alternative, but guaranteeing the ability for any entity to purchase land in any state seems like a lot of power for the federal government to have.