Answer to Question 1
For the past 40 years, the percentage of America's steel produced in vertically integrated firms like U.S. Steel has declined. This is because mini mills have replaced large blast furnaces. Unlike blast furnaces, electric furnaces can be turned on and off almost at will. They often operate late at night when electricity rates are very low, because utilities cannot turn their generators off and restart them in time to meet the next day's load. It is more efficient for a mini-mill to use the market than to integrate upstream.
Answer to Question 2
D
American Red Squirrel
The grand opening of the huge Miraflores lock on the Panama Canal in October, 1914. The locks were b
Maxine Williams was the founder and first president of the AAMA. Printed with permission of American
In 1979 Islamic militants held American embassy workers hostage in Tehran.
John Gast, American Progress.
Out of Many: A History of the American People