Destroying America

A friend asked me if I'd read Richard Lamm's speech on immigration. I had not so he went to find an 'unmolested' copy of the speech and found one on Snopes.com. I read the article and, all I could say in response was, "wow". Even if he never actually made this speech, it mirrors what is going on in America right now. If we really wish to destroy America, all we have to do is sit back and wait. I don't want to sit back. Unfortunately, I have no idea what to do. How do we reverse this?