Lincoln had spoken against the Mexican-American War
Some factors of the Great Depression were the burst of the 1920s credit bubble in the United States as well as the overinflated investing market during the same decade. It helped cause WW2 by radicalising Germans (really by the Nazis) against the rest of the world who they already blamed for their troubles during the 20s.
Great Britain proved that they could defeat the most powerful Navy that existed at the time. Great Britain than became known as the most powerful naval force.
