Not sure about between countries; President Trump pulled us out of various agreements such as TPP, etc.
The harder part is the contracts with companies. I know with us, we have clauses in the contracts that if the company doesn’t perform we can cancel the contract after we take certain steps to correct the issue.
Canceling because the program/project has been stopped, I haven’t had to deal with. We’re working on a project right now where we want to procure a software; once we determine which software we want and the cost, we’ll request a contract be drawn up and the funds appropriated. If the funds aren’t there, then we can’t move forward.
Just a wild guess, but I would think there would be some provision in the contract for the wall and the pipeline that stipulates if the project or funding falls through, then the contract terminates. I read something about the pipeline company was going to sell the remaining pipe for scrap to recoup some of their money.
I wanted to get my law degree in international business law. Due to many issues I gave it up. I know some may think it was a weird goal, but global trade was just warming up and I was good at it.