The legislation was among new Republican-backed restrictions across the country following the 2020 presidential election, when then-President Donald Trump falsely attributed his loss to fraud.
North Carolina is expected to be a closely contested state in this year's presidential contest.
Under the new law, a voter who uses same-day registration is sent a postcard to confirm their address.
Young voters and minority voters, both groups that tend to vote Democratic, take advantage of same-day registration more frequently.
Between 100,000 and 120,000 residents use same-day registration in presidential years, according to the state elections board.
Persons:
Joseph Ax, Roy Cooper's, Donald Trump, Trump, Joe Biden, District Judge Thomas Schroeder, Tim Moore, Jonathan Oatis
Organizations:
Democratic Party, Republican, Democratic, Young, District, State Board
Locations:
Carolina, North Carolina