The National Association of Professional Base Ball Players, commonly known as the National Association, launched its first official season in 1871. This organization was the first attempt to form a professional baseball league in the United States. The opening game took place in Fort Wayne, Indiana, where the Kekiongas squared off against the Cleveland Forest Citys in front of a growing crowd eager to witness this new chapter in sports. The establishment of this league came as a natural progression in the evolution of baseball, which had been gaining immense popularity as a recreational activity. As cities embraced the sport, the demand for more organized and competitive play increased.

Players from various local teams were drawn to the concept of playing professionally, which meant they could receive compensation for their athletic talents. The league allowed player contracts, setting the groundwork for the modern sports industry where athletes are recognized as professionals. The debut of the National Association marked a significant shift from amateur play, leading to the establishment of rules and regulations that would shape how baseball was played. The success of the opening day game stirred excitement about the potential for the league and its ability to attract spectators and teams alike, foreshadowing the future of professional sports in America.

Although it eventually faced challenges, such as financial instability and competition, the National Association was critical in demonstrating the viability of professional baseball. Its formation laid the foundation for future leagues, most notably leading to the creation of Major League Baseball. By solidifying a structure for professional play, the National Association played a crucial role in the institutionalization of baseball as America's pastime.