The Song Dynasty was so large and that was a factor in the empire's decline. They created so many positions within the bureaucracy and the men in those positions received a generous amount of money.
Labor Union is an organized association of workers, often in a trade or profession, formed to protect and further their rights and interests.
The United States first began developing nuclear weapons in 1939, during World War II, under the order of President Franklin Roosevelt. Motivation was the fear that US was engaged in a race with Nazi Germany to develop nuclear weapon. This project is best known as Manhattan Project.
The Battle of Gettysburg was pretty much when people realized the South was going to lose.
