Set a date. Day after 2016 presidential election for instance. Automatically register every US citizen with a known address who are over 18 and/or when they turn 18. Send them an government issued national voter ID card in a certified package. If someone moves to a different city, town, county, state, etc, make the card, the re-registration/change of address of the card available at post offices, town city county municipal buildings, DMVs, schools, municipal courts, town city county library's and historical societies. Allow home bound/elderly/anyone to schedule an "in home" re-registration etc of the card by a county elections commission. Then give a deadline. By 2020 presidential election the national voter ID must be used. Also make presidential election days a federal holiday so everyone who wants to vote can vote. There you go.