What geographic retail strategy did Walmart famously use when expanding across the United States in its early growth phase?

Walmart's geographic expansion strategy has been studied as one of the most successful retail growth models in business history. The company used specific data-driven approaches to determine new store locations, creating a distinct pattern of market penetration that retail analysts now study as a classic case. This poll tests your knowledge of Walmart's geographic expansion strategy that revolutionized retail location analytics.

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Urban center concentration strategy - targeting major metropolitan areas first to establish brand presence
Hub and spoke model - establishing distribution centers first, then surrounding them with stores in a 200-mile radius
Coastal saturation approach - establishing strongholds on both coasts before moving inland to midwestern markets
Population density targeting - only entering markets with at least 250,000 residents within a 10-mile radius