Which group united to reduce the power of railroads and banks over farmers

Arguably one of the most important inventions of the 20th century was a) the transistor. b) air conditioning. c) the vacuum cleaner. d) radio broadcasting.

Which of the following led to a continuation of the treatment in the excerpt above? a)the brutality of the trans-atlantic african slave trade. b)spanish repression after violent native uprisings in new spain during the 16th century. c)european competition to quickly establish colonial holdings in the new world. d)the reliance of the spanish on native americans to provide labor under the encomienda system.

What change took place in the african slave trade in the 1500's?