Introduction
The year is 1866. It is the early beginnings of organized sports leagues in North America. There are no Major Sports Leagues at all but the first-ever Proto-League, the National Association of Base Ball Players was playing.
New Leagues
n/a
Leagues in Operation
Year 10 of play in the National Association of Base Ball Players (NABBP) took place 158 years ago. (source) (source)
Leagues that Folded
n/a
League Champions and Other Events
Baseball
NABBP Champion: Brooklyn Atlantic
Hockey
No leagues in operation.
Football
No leagues in operation.
Basketball
No leagues in operation.
Other Leagues
No leagues in operation.