Construction of ____________________
increased the demand for iron, steel, coal, timber, and other goods.
Demand for goods created thousands of new ____________________ for American workers.
The railroads allowed American industry to expand into the ____________________ part of the country.
During the late 1800s, the government granted more than 400,000 ____________________ for new inventions.
In 1866, a transatlantic ____________________ cable connected the United States with Europe.