The Thirty Years' War was a war fought primarily in Central Europe between 1618 and 1648. One of the longest and most destructive conflicts in human history, as well as the deadliest European religious war in history, the war resulted in eight million fatalities.
In 1870,25 American cities had populations over 50,000.
The correct answer to this open question is the following.
Industrialization transformed American life in the late 19th century as nothing had before. This industrial change transformed the life of the American people. Technology changed farming and many farmers decided to move from the rural areas of the United States to the larger cities where the large factories where located. Those new fabrics were offering many jobs to operate the new machines. Although those were low paid jobs, they represented a relief to the difficult conditions on many Americans.
Important businessmen such as Andrew Carnegie and John D. Rockefeller created huge companies in the steel industry and oil industry, respectively. Although they invested a lot of money to create successful companies, during the Gilded Age those companies were accused of monopolistic practices.
Opportunity cost is the value of the next best alternative forgone as a result of making a decision.
