Answer:In 1947, Salk took a position at University of Pittsburgh, where he began conducting research on polio, also known as infantile paralysis. By 1951, Salk had determined that there were three distinct types of polio viruses and was able to develop a "killed virus" vaccine for the disease.
Explanation:
Answer: Brazil was the last country in the Western world to abolish slavery. By the time it was abolished, on May 13, 1888, an estimated four million slaves had been imported/taken from Africa to Brazil, 40% of the total number of slaves brought to the Americas.
Answer:
D) Millions died while trying to produce enough rubber to satisfy the Belgians. (APEX)
Explanation:
The indigenous population was required to provide rubber to the colonizers, but the amount of rubber was unrealistic, and the punishment for this was death. Because of this, great amount of people died or were mutilated (cut off right hand was a "proof" of killing someone, so sometimes people just cut off hands to prove they killed an indigenous person and claim the reward..).
The primary argument for Japanese imperial expansion, especially in China, was that the Japanese were the superior race, and thus had a rite and obligation to dominate other, inferior cultures.
