Both parties are not the same.
Democrats.
Democrats gave us the KKK.
And fdr put Americans into interment camps and percentage wise, more republicans voted for the civil rights act of 1964
Left-wing Republicans voted for the Civil Rights act of 1964
Left-wing republicans
???? That sounds like a contradictory statement
Why would it be a contradictory statement? Pre-Southern Strategy the parties were less unified in their ideology, but Republicans were generally to the left of Democrats.