Short answers, pulled from the story.
The ABA-NBA merger was finalized on the 17th of June 1976, at the Cape Cod Room at Dunfey's Hyannis Resort in Hyannis, Massachusetts. Merger talks had begun as early as 1970, but the Oscar Robertson antitrust lawsuit and failed congressional legislation delayed the agreement for six years.
Four ABA teams joined the NBA: the Denver Nuggets, Indiana Pacers, New York Nets, and San Antonio Spurs. Each paid a $3.2 million expansion fee. The Kentucky Colonels and the Spirits of St. Louis folded, with their players entering a dispersal draft.
The Chicago Bulls held NBA rights to Colonels star Artis Gilmore and actively lobbied against the Colonels' inclusion. Owner John Y. Brown, Jr. ultimately agreed to fold the team on the 17th of June 1976 in exchange for $3 million, which he used to purchase the Buffalo Braves and later the Boston Celtics.
The Spirits of St. Louis received $2.2 million in cash and a one-seventh share of the four surviving ABA teams' television revenues in perpetuity. The Silna brothers collected those payments for decades until April 2014, when a revised agreement included a $500 million lump sum settlement.
The ABA originated the three-point field goal, the slam dunk contest (first held at the 1976 ABA All-Star Game), pressing and trapping defenses, and drafting of college underclassmen. The NBA adopted the three-point field goal in the 1979-80 season and held its first slam dunk contest in 1984. The ABA also introduced statistical categories including blocked shots, steals, and separated offensive and defensive rebounds in its inaugural 1967-68 season.
The New York Nets sold Julius Erving to the Philadelphia 76ers for $3 million as a direct result of the merger's financial penalties. The Nets had offered Erving to the New York Knicks in exchange for waiving a $4.8 million territorial indemnity fee, but the Knicks declined the offer.