In the context of the border dispute presented by Peru against Chile in the The Hague Court, this study analyzes the influences of two ideological motivational dimensions: Right-Wing Authoritarianism (RWA) and Social Dominance Orientation (SDO) on a set of intergroup attitudes that involve both nations. To this end, a survey study of 196 Chileans and 223 Peruvians participants was conducted. The instruments used to measure ideology and political attitudes are the following ones: RWA Scale; SDO Scale; Scale of Intergroup attitudes between Chile-Peru and specific questions on interest in the Hague litigation and willingness to fight for one's country. The results show that in the Peruvian case attitudes of belligerence and alert and a greater willingness to fight for the country are better explained by the RWA, while in the Chilean case these same attitudes are explained both by the RWA as well as the SDO. On the other hand, pacificist attitudes are explained inversely by SDO in both countries. These findings support the hypothesis that intergroup dynamics between both countries have been marked by expressed actions of a Chilean expansionism versus a Peruvian vengefulness and suggest that equalitarianism will promote attitudes toward respect and cooperation between both groups, changing the frames of expansionism and vengefulness for one of a culture of peace.