[MrEdd]

You can't CLOSE the boarders .. for many reasons

Sure you can build a wall or a good fence, and patrol with enough personnel to do the job. North and South Korea have been squared off against a closed border since before I was born. There may be people who want it to remain open for Economic and/or Political reasons, but militarily it wouldn't be that difficult a task.

The art of war teaches us to rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable.

- Sun Tzu

[Mo1]

Sure you can build a wall or a good fence, and patrol with enough personnel to do the job. North and South Korea have been squared off against a closed border since before I was born. There may be people who want it to remain open for Economic and/or Political reasons, but militarily it wouldn't be that difficult a task.

Securing the boarder with a wall/fence/patrol is not CLOSING the boarders

When you use the word "close" it means you shut down the boarders on all sides by land/air/sea and we become and isolated country