The following sources claiming or supporting Yu Hsien above is letter D. Yu Hsien hated non-Chinese religions like Christianity. Taiyuan massacre during Boxer Rebellion, which killed 45 Christians with children. It was at this time tha Yu Hsien was the governor of Shanxi.
The us advanced with the aid of France
A) The South didn't need to conquer the North to win its independence.
The South was just planning on defending itself till the North grew tired, but the North had to conquer the South to be able to reunite the Union and win the war.