The Colombian government had blocked the United States' efforts to secure rights to the Panama Canal Zone. This made the United States strike a deal to help Panama gain independence.
The most significant contributing factor to the Steel Strike of 1919 in the US was the end of World War I, which left many of those workers who had unionized in federal unions with less opportunities for work then prior and during the war.
Answer:
The current population of Russia in 2021 is 145,912,025, a 0.02% decline from 2020. The population of Russia in 2020 was 145,934,462, a 0.04% increase from 2019. The population of Russia in 2019 was 145,872,256, a 0.09% increase from 2018. The population of Russia in 2018 was 145,734,038, a 0.14% increase from 2017.
Due to the deaths of most of the population, "ordinary farm workers, who had been forced into serfdom previously, shot up by 50%. More bullion among a smaller population meant more wealth across all classes and because the same land was in use and it was now plentiful, it resulted in technological advances as well." - Hank Campbell (found at Science20.com)
About a third of the clergy fell to the Black Death, making answer a. unlikely.
I never found any information stating Peasants migrated into cities for medical care, making answer b. unlikely.
Lower classes benefited from the Black Death economically, therefore c. is my final answer.
Doctors at this time knew nothing about how to cure disease, they also made little to none advancements. Answer d. is very wrong.
