According to Map 1.2: Native North American Cultures, what was among the most important factors in setting boundaries between ancient cultures?

Question

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Map 1.2 shows that different Native North American cultures were typically separated by environmental features such as mountains, rivers, and deserts. For example, the Pacific Northwest culture was separated from the Plains culture by the Rocky Mountains. Therefore, A is the correct choice. While political systems, language systems, and religions may have also played a role in setting boundaries between cultures, the map does not highlight them as the most important factors.