Ok, good question. Say they were building the wall on your land and they didn’t offer you a just price?
Or, not likely, but say you had a cattle trail to some watering hole and they blocked off your watering hole?
Is there no easement on the border?
There are still some similar TX landowner lawsuits in court related to those issues from the Secure Fence Act. Last I heard they were not settled. There is recourse for landowners.
In CA, AZ, NM there is an easement called the Roosevelt Reservation that is supposed to be for border enforcement. There is some debate if it only applies to federal land, the way it is written it would seem so. The thing is it was made a reservation before AZ,and NM became states so what that means could be debatable. A rancher on the border said his ranch paperwork shows the Roosevelt Reservation easement even on deeded ground, not sure that is the same with different owners. Our new crazy lib politicians here in NM say they are not going to allow fence/wall to be built on state land so that will have to be dealt with or by pass and keep going.
There are some issues, but most land disputes other than in TX were dealt with for the Secure Fence Act. There are a lot of areas where a fence can be built without issues while other areas play out.
The thing is every piece that can be and is built is a huge deal. Helps Border Patrol to do their job, even remaining unfenced sections are easier for them to deal with than long stretches of miles and miles with no fence. Every bit really does count.