If the SCOTUS votes to keep TFG on the ballot,

[LeftInTX]

49. Border issues are complex.

Immigration: Who becomes a US citizen, who gets deported, ports of entry: Federal govt.
Border itself: Much of it is on private property, so the property owner actually controls who has access to the property. Much of Texas doesn't have a border wall.
Rio Grande (water) itself: Federal govt. Banks of the river: Whoever owns the property, if it isn't a port of entry.

In the case of the park, it's city property, but since Texas is the state, Abbott has put up shop there. The city could sue, but would likely lose. The razor wire needs to stay on land and not in the water. Buoys put up by Abbott are illegal.

However, there is the spirit of the law and letter of the law. State, local and federal officials all should work together.