[JumpCrisscross]

> things haven't reached that level, it's likely the issue isn't super serious (yet)

This isn't some some weird theoretical aside. Congressional power to modify and break treaties was debated by the founders [1].

Treaties are laws, full stop. Congress breaking them has political consequences. But it's not illegal, and it's no different from amending an act a prior Congress passed.

[1] https://en.wikipedia.org/wiki/Treaty_Clause#Repeal_of_treati...

[bombcar]

Yep, and if it got really really bad 3/4ths of the states can modify the Constitution and over-ride just about anything.

So if the southwest states piss off the rest of the country ...

[JumpCrisscross]

> if it got really really bad 3/4ths of the states can modify the Constitution and over-ride just about anything

You're describing extreme actions relative to a quotidien one. Armed revolution and Constitutional amendments are rare. Congress amending treaties is mundane.

We try to give the other side the courtesy of consultation, but that's (a) far from even common at this point and (b) sometimes impossible. The water rights in question are no different from any other private water rights. The fact that they originated from a treaty a curiosity at best.