For the Southern states, the requirements for readmission to the Union were also fairly straightforward. States were required to hold individual state conventions where they would repeal the ordinances of secession and ratify the Thirteenth Amendment.
In 1901, banker John Pierpont Morgan (1837-1913) purchased Carnegie Steel for some $480 million, making Andrew Carnegie one of the world's richest men. That same year, Morgan merged Carnegie Steel with a group of other steel businesses to form U.S. Steel, the world's first billion-dollar corporation.
In his final years, Carnegie's net worth was US$475 million, but by the time of his death in 1919 he had donated most of his wealth to charities and other philanthropic endeavors and had only US$30 million left to his personal fortune.
There was a war going on between the two. During Pearl Harbor, over 100,000 Japnese-Americans were put into internment camps. And despite Japan eventually surrendering, we still sent bombs to Japan.