Final answer:
The more accurate characterization for the capitalists who shaped post-Civil War industrial America during 1875-1900 is 'robber barons' due to their ruthless business practices and exploitation of workers and the general public.
Step-by-step explanation:
The more accurate characterization for the capitalists who shaped post-Civil War industrial America during the time period 1875-1900 would be 'robber barons'. While some may argue that these businessmen made significant contributions and transformed the nation, their ruthless business practices and exploitation of workers and the general public overshadowed any positive impact they may have had. Examples like Jay Gould, who made his fortune in railroads through exploitative means, demonstrate the exploitative nature of these capitalists.