The Black Death was a devastating global epidemic of bubonic plague that struck Europe and Asia in the mid-1300s. The Black Death is believed to have been the result of plague. An infectious fever caused by the bacterium Yersinia pestis. The disease was likely transmitted from rodents to humans by the bite of infected fleas. The Bubonic Plague attacks the lymphatic system, causing swelling in the lymph nodes. If untreated, the infection can spread to the blood or lungs. The Black Death was a conflict because it caused many people to get sick and hurt making the population going down and many things change and some people even went crazy and people got hurt. The epidemic lasted for decades.