Well, it decreased the demand of Slave Labor.
Back then, the technology advancement , especially in agricultural sector, significantly increased the total production. This cause the demand of overall labor decreased. The northern US, who utilized more of this advancement more than their southern neighbor, manage to produce hundred times more output than the southern who still depended on their slave labor
They were afraid of Germany to get civil rights so the three allies formed a treaty known as the Treaty of Versallies and took away almost everything from Germany and blame Germany for the start of the way and paid tons of money to rebuild everything that was lost.
Are there any options to choose from?