20thcentury aggressiveness agricultureandstate cas casestudies compositionandexercises conflictmanagement cooperation cooperativeagriculture coopérativesagricoles economicconditions emigrationandimmigration empathy englishlanguage etc ethnicidentity ethnology evolutionaryeconomics fieldwork france fraternalorganizations histoire history internationaltrade mexicanamericans microfinance mutualisme(économiepolitique) new politiqueagricole poverty prevention rhetoric socialconditions socialconflict socialnetworks socialsecurity sociedadesagrariasdetransformación societies solidarity southwest studyandteaching teacher-studentrelationships étudesde