Eastern League (Baseball league : 1923- )

"The Eastern League (EL) was a Minor League Baseball (MiLB) sports league that operated under that name from 1938 until early 2021, when it ceased operation due to a reorganization of the minor leagues by Major League Baseball. The league played at the Double-A level in 1963 and later, and consisted primarily of teams located in the Northeastern United States. The league was founded in 1923 as the New York–Pennsylvania League." -- Wikipedia