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Baseball caps were not accepted by people in their daily lives at first, and were considered to be only items for athletes. In 1839, the first baseball game in history was held in the town of Cupers, New York, USA. In 1860, professional baseball players began to appear in the United States. In 1871, the United States established the "National Organization of Professional Baseball Players"; in 1876, the organization was renamed the "American Baseball Association". In 1881, another national professional baseball organization was established, which later became the "National Professional Baseball Association". In 1884, the first championship between the two organizations was held, namely the "World Baseball Championship". After that, in 1910, then-US President William Howard Taft officially approved baseball as the "national sport" of the United States. As a result, baseball caps became popular among various baseball teams. At first, the players only wore them to block the sun, but later, no matter whether it was sunny or rainy, people would wear baseball caps as long as they played. In 1873, baseball was introduced to Japan from the United States. The Japanese professional baseball team was founded in 1934. Baseball caps were introduced to Japanese baseball teams. After World War II, baseball quickly developed in European countries. Baseball has been carried out in more than 100 countries and regions on five continents. Baseball caps became popular in the world, but only among baseball players. People did not regard baseball caps as daily necessities. Baseball caps became a symbol of baseball players at that time.
