求完形填空的答案： The first hundred years after the Civil War saw a succession of obstacles put in
restrictions were removed they still had to51hostility or threat,52that most of them did not dare to face the unpleasantness that was imposed53them when they went to54 or to vote, The federal courts ruled55it was an offence against the Constitution to interfere56anybody in the57of his rights to vote, but for a long time it was very difficult to put such rules into force,58the state and local59themselves did not agree with them. Federal agents have been used in the south to60that people are allowed to use their rights, and many61of threat and abuse of62have been punished. Because of the federal activity for63protection, southern Negroes have gained greater self-confidence, and in the 1960s many who previously did not dare to64their rights felt safe enough to register as voters.