Gettysburg

If the Confederacy had won the Battle of Gettysburg, it would've had a huge impact on the Civil War. It was considered the turning point of the war because it was such an important battle. The Union had lost a lot of battles up until Gettysburg. If the Confederacy had won, the Union might have given up hope on winning the war. Though I doubt France and Britain would have supported the Confederacy because they are against slavery. There would be no point in them supporting a cause that they don't believe in. With no hope left for the Union, President Lincoln would most likely be forced to make peace with the South.