How did Standard Oil affect the U. S. economy as a whole during the Second Industrial Revolution?

A. By encouraging competition among small companies
B. By using profits to raise wages for refinery workers
C. By supporting government safety reforms in industry
D. By helping develop the country's infrastructure

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire

Monopolies were legal in the united states until a)the 1860s. b)the 1870s. c)the 1880s. d)the 1890s.

This map is depicting the 16th century route of what explorer? a) hernando de soto b) james oglethorpe c) sir walter raleigh d) juan ponce de leon