For years, Carmen Cavazos’ neighborhood in southeast Houston has voted reliably for Democrats up and down the ballot. In 2016, Hillary Clinton won 68% of the vote in Cavazos’ voting precinct, a mostly residential enclave of about 3,000 people near Hobby Airport. But something is changing in the precinct, where about nine out of 10 residents are Hispanic.

President Joe Biden carried it by 20 points in his 2020 race against Donald Trump — a solid showing for Democrats, but half of Clinton’s 40-point advantage from just four years earlier against the same Republican. Cavazos, a 44-year-old flight attendant and Republican precinct chair, said she expects the trend to continue in November. She has been trying to accelerate the political shift, helping organize regular meetings of the Saturday Menudo Club, a group that meets monthly at local Mexican restaurants to hear from conservative candidates and other speakers.

“The messaging and voter engagement in our community is critically important,” Cavazos said. “When presented with data, facts, and statistics, the false narrative of identity politics and ideology propaganda encouraged by Democrats crumbles.” Republicans have logged historic gains in South Texas the last couple of elections , making political battlegrounds out of border communities that voted solidly Democratic for years.

That sea change has largely overshadowed the more subtle rightward shift of Latino voters in cities and suburbs away from the border..