The United States incarcerates more people than any other country in the world and for the first time in the nation's history, more than one in every 100 American adults is confined in a prison or jail, according to a report released on Thursday.
The report by the Pew Center on the States said the American penal system held more than 2.3 million adults at the start of the year.
The far more populous nation of China ranked second with 1.5 million behind bars, with Russia a distant third with 890,000 inmates.
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