On August 3, 1949, the BAA agreed to merge with the NBL, expanding the National Basketball Association to seventeen franchises located in a mix of large and small cities, as well as large arenas and smaller gymnasiums and armories. In 1950, the NBA consolidated to eleven franchises, a process that continued until 1954, when the league reached its smallest size of eight franchises, all of which are still in the league (the Knicks, Celtics, Warriors, Lakers, Royals/Kings, Pistons, Hawks, and Nationals/76ers).

While contracting, the league also saw its smaller city franchises move to larger cities. The Hawks shifted from “Tri-Cities” (the area now known as the Quad Cities) to Milwaukee (in 1951) and then to St. Louis (in 1955); the Royals from Rochester to Cincinnati (in 1957); and the Pistons from Fort Wayne to Detroit (in 1957). In 1960, the Lakers relocated to Los Angeles, and the Warriors moved to San Francisco, in 1963. The following year, the Nationals left upstate New York to bring basketball back to Philadelphia, changing their nickname from “Nationals” to “76ers.” This means out of the original eight franchises, only the Knicks and Celtics have not relocated at any point.

Although Japanese-American Wataru Misaka technically broke the NBA color barrier in the 1947-48 season when he played for the New York Knicks, 1950 is recognized as the year the NBA integrated with the addition of African American players by several teams including Chuck Cooper with the Boston Celtics, Nat “Sweetwater” Clifton with the New York Knicks, and Earl Lloyd with the Washington Capitols. Today, more than fifty years later, most NBA players are African American.

During this period, the Minneapolis Lakers, led by center George Mikan, won five NBA Championships and established themselves as the league’s first dynasty. To encourage shooting and discourage stalling, the league introduced the 24-second shot clock in 1954. If a team does not attempt to score a field goal (or the ball doesn’t make contact with the rim) within 24 seconds of obtaining the ball, play is stopped and the ball given to its opponent.

In 1957, rookie center Bill Russell joined the Boston Celtics, who already featured guard Bob Cousy and coach Red Auerbach, and went on to lead the club to eleven NBA titles in thirteen seasons. Center Wilt Chamberlain entered the league in 1959 and became the dominant individual star of the 1960s, setting new records in scoring (100) and rebounding (55). Russell’s rivalry with Chamberlain became one of the great individual rivalries in the history of American team sports.