• Settlement of the Great Plains

• Creation of standard time zones

• Establishment of the first federal regulatory

agency

• Introduction of new methods of business

management and finance

These developments in the late 19th century

show the importance of

(1) railroads on the development of the United

States

(2) agrarian reformers in western states

(3) the labor union movement on the nation

(4) the oil industry in increasing American power

in the world