Which geographic region did Amazon choose to test its second wave of Amazon Go stores after the initial Seattle launch, revealing a key strategy in their brick-and-mortar expansion?

Amazon Go stores revolutionized retail with their 'Just Walk Out' technology, allowing customers to shop without checkout lines. This innovation combines computer vision, sensor fusion, and deep learning to create a seamless shopping experience. But did you know that the geographic distribution of these stores follows a strategic pattern? Test your knowledge about how this retail innovation has spread across different regions and what it reveals about market testing strategies for cutting-edge retail concepts.

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California's tech corridors (San Francisco & Silicon Valley)
Chicago's diverse urban neighborhoods
New York's high-density Manhattan district
Washington D.C.'s political and tourist centers