The election of JFK was the end of America.
Funny—my New York Irish grandparents, all four of them, were Republicans; but THEIR parents (their fathers, anyway) were Democrats (two involved in Teapot Dome), and I’d agree with your grandfather. But I’m not sure the D-R split came as late as the 60s. Sen. Taft began the separation that defined the conservative-liberal split, and he was early 50s. Then came the split among Republicans—McCarthy/Taft wing vs. the Eisenhower/Rockefeller wing in the mid-fifties which unfortunately resulted in the JFK/LBJ debacle. Because Nixon had creds on both sides of the liberal-conservative Republican split in 1960 (even without Eisenhower’s long-withheld support), he was the GOP’s best hope but still lost, perhaps through fraud. Finally elected in ‘68, he was a better president than any we’d had in the 50 preceding years, the first to understand communism (THE defining Conservative-Liberal discriminator).