The B-2 production goal wasn't cut from 131 to 21, it was cut to zero. By the early 90s the USAF didn't want it. In one of life's great ironies, far left congressman Kweisi Mfume from Maryland got up before his fellow representatives and made the case to keep the B-2 and to have at least 20 of them. It was a great speech, but I'm not really sure of his motivation since I'm not aware of any of the aircraft's contractors having a presence in Maryland, though I could be wrong. Anyway, his performance did the trick.