the medicine that was discovered and removed a roadblock to European conquest of Africa was Quinine.
Quinine is an anti-malaria drug that works to kill the parasites that infect the blood and cause malaria.
This allowed Europeans to conquer sub-Saharan Africa at a faster rate because it meant that malaria no longer killed Europeans in large numbers.
find out more on Qunine at https://brainly.com/question/17239452.
#SPJ1