Who said anything about walls? A state’s borders are defined by the land area over which it upholds its own legal system. If a state’s legal system is unenforce

Who said anything about walls? A state’s borders are defined by the land area over which it upholds its own legal system. If a state’s legal system is unenforceable within its so called “borders”, then by definition those are either no longer its borders, or the people living within the land area over which the state’s legal system cannot be enforced are living in a failed state. The borders will have become disputed in that case.