What would this wall bring?

President George W. Bush signed onto the law making a wall on the U.S.-Mexico border from coast-to-coast legal. Now it just faces funding obstacles.

What obstacles to the environment, good relations with Mexico and so on might this wall bring on?

It is an issue with many, many questions.

Walls don't seem to work totally, but maybe that's not what its builders would be concerned with, anyway. The Berlin Wall, pictured here from the Newseum in Washington, DC, the Maginot Line and Great Wall of China weren't complet deterents to invasion, or escape. The East Germans had snipers posted to cut down would be escapers into West Berlin. I hope this thing isn't carried that far.

It's OK to work to keep out terrorists and undesirable illegal aliens, but very expensive walls are far from the only, or probably main thing, that such duties will require. Virtual -- electronic -- walls are possible, as it is too.

We will keep an eye on this thing.