Mary Kaldor has influentially argued that understanding violence in the current period of globalization depends upon the recognition that this is an era of `new wars'. This article critiques that view and in so doing proposes a global warring hypothesis to help explain current US military violence. The argument is formulated as follows. First, the concept of new wars is critiqued, and it is suggested that local, global, and world warring are the varieties of warfare that predominate in the current conjuncture and, hence, require analysis. Second, the global warring concept is introduced and is utilized in a global warring hypothesis, a generalization of which has the virtue of explaining the wars of George W. Bush's regime. Third, evidence is provided that supports the hypothesis.