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Showa 66 is the impossible year the game is set in, an alternate continuation of the Japanese era name in which the economic bubble never burst and Japan bought most of the United States.
Showa American Story is built as a semi-open world of separate city areas that open as the story advances, linked by the road and by Choko's RV rather than by one continuous map.
The Cataclysm is the unexplained catastrophe that ended the Showa 66 world's social order and left behind the zombie-ridden wasteland Chigusa Choko wakes into.