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The American League was conceived in 1901 as a rival threat to the well established National League. Despite the presence of teams in National League-occupied cities as well as various social and economic pressures, the American League thrived, reaching its Golden Anniversary in 1951. In 1951, each team within the American League commemorated its 50 years of existence by wearing a patch on the left sleeve of their uniform. The New York Yankees, who originated in Baltimore as the Orioles, raised another title banner in their famed Yankee Stadium that year as the great Joe DiMaggio concluded his Hall of Fame career after the Yankees defeated the New York Giants for their 14th World Series title. DiMaggio’s exit made way for a switch hitting youngster from Oklahoma named Mickey Mantle.