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The American League of Major League Baseball begins using the designated hitter.

Historical image related to The American League of Major League Baseball begins using the designated hitter. from April 6, 1973

American League

League within Major League Baseball

The American League of Professional Baseball Clubs, known simply as the American League (AL), is the younger of two leagues constituting Major League Baseball (MLB) in the United States and Canada. It developed from the Western League, a minor league based in the Great Lakes…
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Major League Baseball

North American professional baseball league

Major League Baseball (MLB) is a professional baseball league in North America composed of 30 teams, divided equally between the National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB is one of the major professional sports leagues…
Source: Wikipedia (CC BY-SA)

Designated hitter

Offensive position in baseball and softball

The designated hitter (DH) is a baseball player who bats in place of another position player, most commonly the pitcher. Unlike other players in a team's lineup, they generally only play as an offensive player and usually do not play defense as a fielder or a pitcher during a…
Source: Wikipedia (CC BY-SA)