Original sentence: Beginning in the 1960s, the party's core base shifted considerably, with the Southern states becoming more reliably Republican in presidential politics and the Northeastern states becoming more reliably Democratic.By the end of the 1960s, the Southern states became more reliably Republican in presidential politics with the Northeastern states becoming more reliably Democratic.Historically, the Republican base initially consisted of Northern white Protestants and African Americans nationwide, with the first presidential candidate John C.The liberal Republican element was overwhelmed by a conservative surge begun by Barry Goldwater in 1964 and fulfilled during the Reagan Era
Edited sentence: After the Civil Rights Act of 1964 and the dismantling of Jim Crow laws, the core base shifted considerably, with the Southern states becoming more reliably Republican in presidential politics and the Northeastern states becoming more reliably Democratic.After the Civil Rights Act of 1964, the core base shifted considerably, with the Southern states becoming more reliably Republican in presidential politics and the Northeastern states becoming more reliably Democratic, especially since 1992.Historically speaking, the Republican base initially consisted of Northern white Protestants and African Americans nationwide, with the first presidential candidate John C.The weak liberal Republican element was overwhelmed by a conservative surge begun by Barry Goldwater in 1964 and fulfilled during the Reagan Era