Baseball
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black player on the roster. That year, the Major League Baseball Players Association was founded. It was the first professional baseball union to survive more than briefly, but it remained largely ineffective for years. No major league team had been located west of St. Louis until 1958, when the Brooklyn Dodgers and New York Giants relocated to Los Angeles and San Francisco, respectively. The majors' final all-white bastion, the Boston Red Sox, added a black player in 1959. With the integration of the majors drying up the available pool of players, the last Negro league folded the following year. In 1961, the American League reached the West Coast with the Los Angeles Angels expansion team, and the major league season was extended from 154 games to 162. This coincidentally helped Roger Maris break Babe Ruth's long-standing single-season home run record, one of the most celebrated marks in baseball. Along with the Angels, three other new franchises were launched during 1961–62; with this, the first major league expansion in sixty years, each league now had ten teams. The players' union became bolder under the leadership of former United Steelworkers chief economist and negotiator Marvin Miller, who was elected executive director in 1966. On the playing field, major league pitchers were becoming increasingly dominant again. After the 1968 season, in an effort to restore balance, the strike zone was reduced and the height of the pitcher's mound was lowered. The following year, both the National and American leagues added two more expansion teams; the leagues were reorganized into two divisions each, and a post-season playoff system leading to the World Series was instituted. Also in 1969, Curt Flood of
the St. Louis Cardinals made the first serious legal challenge to the reserve clause. The major leagues' first general players' strike took place in 1972. In another effort to add more offense to the game, the American League adopted the designated hitter rule the following year. In 1975, the union's power—and players' salaries—began to increase greatly when the reserve clause was effectively struck down, leading to the free agency system. In 1977, two more expansion teams joined the American League. Significant work stoppages occurred again in 1981 and 1994, the latter forcing the cancellation of the World Series for the first time in ninety years. Attendance had been growing steadily since the mid-1970s and in 1994, before the stoppage, the majors were setting their all-time record for per-game attendance. The addition of two more expansion teams after the 1993 season had facilitated another restructuring of the major leagues, this time into three divisions each. Offensive production—the number of home runs in particular—had surged that year, and again in the abbreviated 1994 season. After play resumed in 1995, this trend continued and non-division-winning wild card teams became a permanent fixture of the post-season. Regular-season interleague play was introduced in 1997 and the second-highest attendance mark for a full season was set. The next year, Mark McGwire and Sammy Sosa both surpassed Maris's decades-old single season home run record and two more expansion franchises were added. In 2000, the National and American leagues were dissolved as legal entities. While their identities were maintained for