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Multiple modality is spread across the wider Atlantic region, both within individual varieties and across variety types. Based on corpus-based evidence, it is argued that first and second tiers of multiple modals carry high diagnostic value and that regionally separated Anglophone areas differ in their preference for first-and second-tier components in modal constructions. Semantics is a typological diagnostic, as there exists a continuum, the “Multiple Modal Belt,” that consists of three main clusters of varieties primarily differentiated by their respective compositional preferences: North American varieties favor epistemic ‘weak probability’ elements (e.g., might) as first-tier modals; Caribbean varieties favor ‘high probability’ or ‘certainty’ (e.g., must). Multiple causation and contact-induced change are offered as explanations for supra-and subregional variation in the Atlantic region, and there is strong evidence that the preference for second-tier components originally represented Scottish origin and subsequent diffusion with locally differing contact scenarios. Locally distinct preferences for semantic compositionality—particularly based on preference for first-tier ‘high-probability’ modals—are used to model a geo-typological clustering of varieties throughout the wider Atlantic region.