National Professional Soccer League (1967)

The National Professional Soccer League (NPSL) was a North American professional soccer league that existed for only the 1967 season before merging with the United Soccer Association (USA) to form the North American Soccer League. It was a "wild league", as it was not sanctioned by FIFA. It had ten charter members, nine from the United States and one from Canada.

Source: Wikipedia — National Professional Soccer League (1967) (CC BY-SA 4.0)