When did Supermax prisons begin to emerge throughout the country?

Name: When did Supermax prisons begin to emerge throughout the country?
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Supermax prisons began to emerge in the 1990s, as a response to rising levels of violence in prisons and concerns about the ability of traditional maximum-security prisons to manage high-risk inmates. The first modern supermax prison, the United States Penitentiary Administrative Maximum Facility (ADX) in Florence, Colorado, opened in 1994.

When Did Supermax Prisons Begin to Emerge Throughout the Country