Wal-Mart has grown to become the largest retailer in the world since Sam Walton opened the first store in 1962. The document provides a history and chronology of Wal-Mart's expansion across the US and into new retail formats. It outlines Lee Scott's new role as CEO in the 2000s and poses the key question of what strategies he should employ to maintain Wal-Mart's dominance globally into the future.