Video revolves around US 1stThe 16 presidents experienced the Civil War and told the story of the internal unity of the United States. It happened in January 1865. At this time, the American Civil War was almost over and the North was about to win. We have been working hard on the battlefield where there is no gunpowder, but the U.S. Constitution cannot be changed. We can only promote the 13th amendment to the Constitution, which puts Lincoln under unprecedented pressure from both inside and outside the party. Lincoln's opponents The Democratic parties, mainly in the South, have always wanted to insist on slavery. Lincoln's Republican party has repeatedly asked Lincoln to postpone the voting time. Everyone expresses different opinions, and they don't want to see when races have equal rights, because everyone is very afraid of a world that they will soon be out of control, or Lincoln resists all pressure, overcomes the difficulties in front of him, and enshrines the Constitution The amendment was successfully passed, abolishing slavery, and finally unifying the United States.