Groups like Ku Klux Klan resisted Reconstruction by

Creating violence against the Africans and Republicans in South.

Explanation:

The Ku Klux Klan began in the Reconstruction period in America, particularly in the South. The South lost its battle in the Civil War but did not miss its boldness to deal with the freed slaves. The former Confederate ex-soldier established the Ku Klux Klan (KKK) in 1865. They created violence and terrorize black and Republican leaders in the South. The purpose of the KKK was to change the politics in the South to bring back white supremacy.

the article must be ratified by three-fourths (38) of states within a proscribed deadline.

source: