Which group was created in late 1865 to resist reconstruction efforts in the south?

Ku Klux Klan

Explanation:

After the American Civil War

(12 Apr 1861 – 9 Apr 1865), there was a Reconstruction (between 1865-1877) which was implemented through the Bureau of Refugees, Freedmen and Abandoned Lands. The Bureau was established in 1865 by Congress to help millions of former black slaves and poor whites in the South.

After the passage of the Reconstruction Act of 1867, newly enfranchised blacks gained a voice in government for the first time in American history.

However the Ku Klux Klan, a white supremacist group emerged to suppress and victimize newly freed slaves thereby resisting reconstruction efforts in the Southern part of the country.

google it and it will pop up