<human>:  When did the Attica prison break happen?
<bot>: The Attica prison break happened in 1971. It was a prison riot that took place in the Attica Correctional Facility in Attica, New York. The riot began on September 9, 1971, and lasted for four days. The riot was caused by a number of factors, including overcrowding, poor conditions, and a lack of resources. The riot resulted in the deaths of 43 people, including 13 guards.