Which region first implemented widespread 'unmanned convenience stores' (fully automated stores with no human staff) as a mainstream retail innovation?

The retail landscape varies dramatically across different geographic regions, with local innovations often reshaping global shopping trends. This poll tests your knowledge about how geographic factors influence retail innovation and shopping experiences around the world. Can you identify which region pioneered a groundbreaking retail concept that changed how we shop?

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China (particularly in urban centers like Shanghai and Shenzhen)
Scandinavia (Sweden, Norway, and Denmark)
Japan (starting in Tokyo's tech districts)
United States (beginning in Silicon Valley)