The roles hadn't just swapped. It was a gradual change. The KKK of the 20s was mainly in support of segregation-advocating democrats.
I understand and agree with you, but the way you put it across makes it sound like an immediate dichotomic reversal.
English
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It's why I said "By the turn of the 20th century". I didn't mean for it to sound like "So in 1917, the roles swapped." I wanted to give it a range of time.
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By the turn of the 20th century means by the time the 1900s came around. At least in my mind.
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