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The second of two principles contained in the "Just War Theory," Jus Ad Bellum and Jus In Bello. Jus In Bellum in Latin means "The Law in Waging War." It defines standards by which a country can conduct war maintain that they have "just" actions in war. The term was coined in the same era in which the League of Nations originated. However, it was not used in doctrine until the late 1940s. Its principles include discrimination and proportionality. Descrimination defines legitimate targets and proportionality defines how much force to be used.
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