From colonial footraces to modern mobile betting apps, American sports have always existed primarily as vehicles for gambling. This comprehensive history traces how betting culture didn't just influence professional sports—it created them. Through horse racing's 19th-century boom, baseball's Black Sox scandal, basketball's point-shaving crisis, and the explosive growth of DraftKings and FanDuel, the throughline is unmistakable: organized sports in America serve wagering, and wagering funds sports.