Wisconsin voters approved a constitutional amendment in Tuesday’s elections that bars foreign nationals from voting in the state.

Republicans across the country have been pushing voters to adopt constitutional amendments that explicitly prohibit non-U.S. citizens from voting. The move was spurred by the District of Columbia and municipalities in California, Maryland and Vermont allowing non-citizens to vote in local elections.

The Wisconsin Constitution states that every U.S. citizen who is at least 18 can vote. The amendment revises that language to read that only U.S. citizens can vote in federal, state and local elections held in Wisconsin.

There are eight states with this kind of constitutional amendment on the ballot this year. Oklahoma also passed a state question limiting voting to “only” U.S. Citizens, a one-word change to its constitution. Wisconsin and Oklahoma join other states like Alabama, Louisiana, Colorado, and Florida which have passed similar measures to restrict voting to “only citizens.”