What cause the Nuer to give up pastoralism and seek refuge outside Sudan?

Nuer/naath are peopple from southern Sudan. Some have give up pastoralism for formal education purpose not because of civilwar

nuer wanted advance education for national unity

nuer want to free maginalize group from Arab hence give up pastoralism

nuer don`t want stupid cat to destube them in term of social,economics,culture,spiritual,political and geographical issues

gatwech bipal both