The National Basketball Association (NBA) is the preeminent men's professional basketball league in Canada and America. Having thirty franchised affiliate clubs (29 in the United States and 1 in Canada).
The NBA has been frequently thought of as the leading men's professional basketball league across the world. It is an active member of USA Basketball (USAB), which is recognized by FIBA (also known as the International Basketball Federation) as the national governing body for basketball in the United States.
On August 3, 1949, representatives from the two leagues met at the BAA office buildings in New York’s Empire State Building in order to complete the merger. Maurice Podoloff, head of the BAA since its creation, had been chosen head of the new league. The new NBA was made up of 17 teams that represented both small towns and large cities across the country. Through the 1950s, though, the number of teams dwindled, along with fan support, and by the 1954-55 season, only eight teams remained.
That year, the league transformed the game with the creation of the 24-second clock, making play faster-paced and more fun to watch. Fans returned, and the league, now financially solvent, expanded throughout the 1960s and 70s. Today, the NBA has 30 franchises and attracts players and millions of fans from countries around the world.
It seems like the official NBA webpage says this:
The NBA identifies November 1, 1946 as the day the first NBA game was held in Toronto, Ontario, Canada, featuring the Toronto Huskies and the New York Knickerbockers which the Knickerbockers won 68-66.
But they are wrong, considering that the NBA didn’t exist in 1946.
The 1948-1949 season began on Nov 1, 1948 with the St. Louis Bombers vs. Minneapolis Lakers (80-84) and ended on Mar 20, 1949 with Philadelphia Warriors vs. Minneapolis Lakers (78-9) it ended 5 months before the BAA changed to NBA.
The 1949-1950 season began on Oct 29, 1949 and only from here on you can call it NBA because it was founded 2 months earlier.
The first NBA game was between the Denver Nuggets and Tri-Cities Blackhawks on the 29th of October 1949, where the Blackhawks won 93 to 85.
The Minneapolis Lakers won against the Syracuse Nationals and become the first team to win the NBA Finals before moving to Los Angeles later in the 1950s.
History highlights of the NBA (1949-2011)
The NBA at 50 Documentary