She chose to find a position at Hogwarts instead of continuing her career at the Ministry of Magic.
She told Umbridge on 10 September 1995 that she had been teaching at Hogwarts for "thirty-nine years this December." Assuming that she meant "this coming December," it would be 1956.
Minerva McGonagall begins teaching at Hogwarts
Date December, 1956
Certainty Inferred from canon
Location in Canon PA18: Moony, Wormtail, Padfoot and Prongs OP15: The Hogwarts High Inquisitor
Type of Event Wizarding world
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