I say let every ignorant Tennesseean sign it with his phot ID. Then immediately retract that persons American citizenship and seize all his/ her assets. Then they immediately become illegal immigrants who have denounced America.
From there, we use the one for one method. Every Mexican who is just dying to become an American, gets that persons citizenship in America.
Also, we can first allow the Mexicans up through Arizona and then head east to wall off the northern Border of Texas so that they can no longer travel into America. The Mexicans can gladly earn their citizenship by guarding the border and not allowing anyone past the border.