What was not examined by the investigative journalists in the late nineteenth and early twentieth centuries?
A. Brutal working conditions in mines on railroads
B. long hours required of sharecropping farmers
C. John D. Rockefeller’s corrupt practices at standard oil
D. Violations in the meatpacking industry

A

Explanation:

C and D are easily eliminated; farmer life did not grow. It's been steadily shrinking since the 1700s. B sounds good initially, but people were moving to cities, where all the attainable jobs and payable rents were - most people couldn't afford to just buy a ton of land and start farming, and suburbs didn't really exist for the same reason. So it has to be ‘A’.

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation: