Nearly 2 million dead Americans are still on active voter registries, and 1 in every 8 registrations in the United States is invalid or has major inaccuracies, according to a new study.

Research released Tuesday by the Pew Center on the States shows that the country is spending more on voter registration while getting worse results than other nations such as Canada. The study points to antiquated systems that don’t reflect modern technology and fail to address the biggest obstacles to maintaining accurate, up-to-date voter-registry databases.

Almost 3 million Americans are actively registered to vote in multiple states, while about 12 million have old or error-ridden addresses listed on their registrations, likely preventing voting-related mail from reaching them. And 1 in 4 eligible citizens — 51 million in total — aren’t registered to vote.

“Voter registration is the gateway to participating in our democracy, but these antiquated, paper-based systems are plagued with errors and inefficiencies,” said David Becker, Pew’s director of election initiatives. “These problems waste taxpayer dollars, undermine voter confidence and fuel partisan disputes over the integrity of our elections.”

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