How does America provide protections against sickness and disease as Tuberculosis, Malaria, and Ebola?

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.

the use of email to replace slower surface mail.

d

explanation:

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.