•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