Don't know why you're being downvoted. You're absolutely correct. The Democratic and Republican parties had polar opposite platforms from their present ones until the Southern Strategy beginning in the late 1960s.
Its actually a lot more complicated than that. Prior to the Southern Strategy by Republicans exploiting this fact (and, really, for several decades after), the Democratic Party -- especially post-New Deal -- was a weird coalition between left leaning groups and southern conservatives (a result of the fact that the national parties were largely coalitions of state parties, and stretching back to the Civil War the Republican Party was the establishment party of the North and the Democratic Party the establishment party of the South, which sort of resulted in the opposite party often being the anti-establishment party in other regions if it existed at all -- and its worth noting that lots of states were effectively one-party states even moreso than is the case anywhere today.)
OTOH, the Southern Strategy was a direct result of Republicans realizing that Democrats were vulnerable in the South because the Democratic Party as a whole was no longer voting in line with Southern conservatives.
