You're talking about becoming a citizen. How many of the illegals are interested in doing that now that they're here?
Let's get back to why they are here. Money. They can come here & earn their keep with a work visa. Much easier to come by than you think & often sponsored by agro business. It would not be terribly difficult for them to be here legally AND earn the money they need AND work toward becoming a citizen. They simply choose not to go through the effort - Most likely because of the curruption south of the border, not because of obstacles set up by the US.
