What if we became an isolationist country, again?

Thinking out of the box, hey? I do not think it would be a bad idea at all. Occupying other countries is what led to 9/11. We can not go on policing the world like we are. We need to get out of the U.N. and in fact get our own government out of our private lives and let us deal with and regulate at a local and state level. Each state knows their needs and shouldn't be dictated as they are today.