As the United States industrialized and became a manufacturing company, what was a major impact on the labor force? More farm workers were needed to feed the growing population
Factory workers were provided safe working conditions
Labor unions were widely accepted
Less farm workers were needed due to mechanical tools

Which of these would be most useful in studying the effect of germs exchanged between the new and old worlds? a. a graph showing the number of europeans between 1492 and 1600. b. a graph showing the number of native americans between 1492 and 1600. c. a primary source description of the symptoms of an unknown disease affecting native americans in 1492. o d. a primary source description of the symptoms of an unknown disease affecting europeans in 1492.