Which of the 18 powers gives Congress the most flexibility to adapt to unforeseen future changes?

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.

The authors of documents a and c define total war as

Nations that do not have an industrial economy are called?