Final answer:
The four successive years of drought in the Sahel zone in the 1980s forced Wodaabe herders to migrate their flocks in search of better grazing areas, leading to conflicts with settled agricultural communities.
Step-by-step explanation:
The four successive years of drought in the Sahel zone in the 1980s had a significant impact on the lives of the Wodaabe herders. Due to the scarcity of grazing land caused by the drought, the herders were forced to migrate their flocks and herds to other regions in search of better grazing areas. This migration often brought them into conflict with settled agricultural communities as they competed for limited resources.