Answer:
These diseases wiped out many of the Indigenous people who lived in the Americas. They had never been exposed to these and were very weak against them. However, Africans had already been exposed to Europeans years prior. They have built up resistance to these diseases. So, Europeans began to ship out Africans to the Americas because they could work and not fall susceptible to European diseases like the Indigenous did.
It depends on what you take to be the beginning and what the end. It lasted two years if you understand it as from the time it was revealed to the time Nixon resigned. It lasted 5 years if you take it from the time Nixon began doing it to the time he resigned.
Answer wouldn’t be B because the Sherman Anti-Trust Act of 1890 forbade any restraint of commerce, which was used against labor unions. However, the Clayton Anti-Trust Act, passed during the progressive era, exempted unions from the Sherman Anti-Trust and stronger enforced the act. The Elkins and Mann-Elkins Acts didn’t really do anything for labor; they just gave the ICC more power to regulate railroads and interstate commerce, along with the Hepburn Act.
In short, best answer would be A.
