Amazon has dethroned Walmart as the top company on the Fortune 500 list, ending Walmart's 13-year reign as the highest-earning U.S. company. This milestone underscores Amazon's dominance in the e-commerce sector, driven by a $700 billion revenue last year, a 12% increase from the previous year. This shift highlights the growing influence of digital retail and the changing landscape of traditional brick-and-mortar retail giants.