Maintaining international order is sometimes held above short term economic losses. See the ongoing war with Russia for another example. My question is, does Texas have the right/authority to do this?
Does Biden have the right/authority to just ignore the law and refuse to enforce it?
It starts at the top.
If he can do whatever he wants to do, so can/will others.
Exactly this.
No, they definitely do not. Foreign relations is a federal responsibility, as laid out in the constitution.