The President that used subtle signals of support for southern whites’ resistance to racial equality was Ronald Reagan.
This is evident when in 1980, while campaigning, he claimed that he believed in "state's rights" at the Neshoba County Fair in Philadelphia, Mississippi.
Ronald Reagan, a President from Republican Party, subtle signal later sparked the shift in southern support for the republican party.
Given the location of the Neshoba County Fair in Philadelphia, it was widely believed that Ronald Reagan used the infamous southern strategy to canvass votes from the conservative American or Southern white Americans.
Hence, in this case, it is concluded that the correct answer is Ronald Reagan.
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