The first computers emerged in the

The first broadcasting corporation was 

The _________ industry was the hardest hit by the use of robots.

Time zones were invented by railroad companies.

Margaret Sanger, one of the driving forces behind the invention of oral birth control, was famous as the

Gresham’s Law, as it applies to culture and commercial broadcasting, states:

The Morrill Act provided federal land to encourage the building of  

Railroads were eventually supplanted by __________.

The largest single group of workers in the United States during the Industrial Revolution did

Which war was the first mechanized war?