The G.O.P. pollster Patrick Ruffini’s book “Party of the People” outlined the realignments reflected in this year’s election results.

Donald J. Trump’s biggest gains were along the Texas border, a Democratic stronghold where most voters are Hispanic. He won 12 of the region’s 14 counties, up from five in 2016.

© Gabriel V. Cárdenas for The New York Times

The 2024 election has the potential to challenge the New Deal realignment of 1932 as the most consequential election of the past 100 years.

This multiracial and multiethnic demographic could transform American politics.