Military action
source: Uprising comic, https://www.youtube.com/watch?v=cpGrY9i8TSA&t=43s
Tracer says Uprising occurs "20 years after we won the war against the omnics", which places the end of the first Omnic Crisis at 27 years before the Recall. source: https://www.youtube.com/watch?v=B5wDV8x6w7s