The group of American voters has experienced the greatest change in party attachment since the civil rights period is the black interest group.
Black interest group is defined as those group in which there is the engagement of black men of the America.
In the black interest group, the voters of America have experienced the greatest change in party attachment since the civil rights period due to the black groups' involvement in the voting.
Therefore, the group is the black interest group that make many changes in the attachment of the occasion.
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