Location: San Jose, California
Population: 2,000,
1,000 African-American,
1,000 Caucasian.
Experiment: See how, and if 2 groups of racial extremists can interact and "keep the peace".
Outcome: After only 80 years Vault 9 devolved into chaos, it started when resources started to dwindle and rationing started, with a couple murders and assaults here and there, then fights in the cafeteria, and eventually security fought each other rather than the law-breakers. With security and staff joining on the interracial fighting a 1 month war started between black and white.
Eventually when the fighting stopped, Vault 9's door opened and the survivors were greeted only by the Master's Unity. The Lieutenant, seeing Vault 9 as evidence of how humankind could only be united through his Master's "divine" intervention, flocked the survivors to mariposa and gradually turned them all into super mutants.
Many of those mutated lost their original radical beliefs, at the cost of their humanity.