Since the 1990s, eligible voters in the country of Mexico (i.e., persons of age 18 or greater) have had to visit an electoral office and be registered into the electoral census in order to obtain a voting card issued by the National Electoral Institute (formerly the Federal Electoral Institute). Those voting cards are government-issued photo IDs, credentials that citizens are required to produce at polling stations in order to vote in federal elections in Mexico. The United States has no equivalent national voter requirements or voter ID card, however. Some states require voters to produce photo IDs in order to...