Race riots and __________ contributed to the popularity of the Ku Klux Klan in Oklahoma during the 1920s.

Race riots heightened racial tensions in Oklahoma during the 1920s, while the Ku Klux Klan also gained support by presenting itself as a respectable civic and moral organization. That increased air of respectability helped make the Klan more popular. The correct choice is “an increased air of respectability.”

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