During reconstruction, many southerners became increasingly angry, which was demonstrated by
a. the increase of white supremacist groups.
b. the arrival and embrace of carpetbaggers.
c. the mob violence committed by scalawags.
d. the rise in republican party membership.

A. the increase of white supremacist groups.

Explanation:

White supremacy was dominant in the United States both before and after the American Civil War, and persisted for decades after the Age of Reconstruction.In the pre-war era in the South of that country, this included slavery. of a large part of the African-American population, with four million of them denied their freedom.The outbreak of the Civil War saw the desire to defend white supremacy being cited as a cause for state secession and training of the Confederate States of America In an editorial on Native Americans in 1890, the author L. Frank Baum wrote: "The whites, by law of conquest, by justice of civilization, are the owners of the American continent, and the best security of the border settlements will be guaranteed by the total annihilation of the few remaining Indians. "

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