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Y Gorllewin Gwyllt
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Cyfnod yn hanes yr Unol Daleithiau adeg ehangu'r goror tua'r gorllewin yn y 19g oedd oes y Gorllewin Gwyllt (Saesneg: Wild West, Old West neu'r American frontier).
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- Am y genre, gweler Y Gorllewin Gwyllt (genre).