The History of Baseball Americans began playing baseball on informal teams, using local rules, in the early 1800s. By the 1860s, the sport, unrivaled in popularity, was being described as America's "national pastime." Alexander Joy Cartwright of New York invented the modern baseball field in 1845. Alexander Cartwright and the members of his New York Knickerbocker Base Ball Club devised the first rules and regulations for the modern game of baseball.
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