source: A historian has stated that "it was quinine's efficacy that gave colonists fresh opportunities to swarm into the Gold Coast, Nigeria and other parts of west Africa".
target: A historian has stated that "it was quinine's efficacy that gave colonists opportunities to go into the Gold Coast, Nigeria and other parts of west Africa".
references: A historian has stated that "it was quinine's efficacy that gave colonists opportunities to go into the Gold Coast, Nigeria and other parts of west Africa". A historian said it was quinine was so good it gave the people settling there new chances to go to the Gold Coast Nigeria and other parts of west Africa. Historians say that an anti-malaria drug let colonists enter west Africa in large numbers. Quinine's potency gave colonists opportunities to swarm into the Gold Coast, Nigeria, and other parts of west Africa. A historian said that quinine caused colonists to go to west Africa. A historian has stated that "it was quinine's efficacy that gave colonists fresh opportunities to swarm into...west Africa". A historian has said that "it was quinine's success that gave the colonists new opportunities to flood into the Gold Coast (Nigeria and other parts of west Africa)". A historian stated that, "it was quinine's effectiveness that allowed colonists to go to the Gold Coast, Nigeria and other parts of west Africa". A historian said that quinine helped colonists settle in the Gold Coast, Nigeria, and other parts of west Africa. A historian said that "it was quinine's efficacy that gave colonists fresh opportunities to swarm into the Gold Coast, Nigeria and other parts of west Africa".