The former Confederates had to swear an oath of allegiance after the Civil War. It promoted by Radical Republicans to prevent the political activity of Confederate veterans and supporters in the South. A confederate person had to swear to support and defend the Constitution of the United States.
It was "<span>D. Yugoslavia and Czechoslovakia" that the United States supported in order to resist Communism spreading in the region. This was under the umbrella of the Truman Doctrine. </span>
