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 is a foreign policy that is supported by the use or threat of military force<span />
Yes the allies showed they could reliably deliver food for the majority of the population and showed how dominant the allied Air Forces were while on the flip side they were causing food shortages on east Germany which the Russians believed could lead to an over throw of the government so I would say it was very successful