Which was not a social problem the United States faced at the end of the Civil War? A. lawlessness in former Confederate states B. discrimination against former slaves C. anger over women gaining the right to vote D. resentment and anger over the war

Out of that list, the one that was not a social problem the United States faced at the end of the Civil War was C. anger over women gaining the right to vote because women did not gain the right to vote following the Civil War - that would not occur until the 19th Amendment (women's suffrage) at the height of th early 20th century Progressive Movement.