2,319,258 Americans Behind Bars in 2008, Most of Any Nation

"For the first time in U.S. history, more than one in every 100 adults are in jail or prison, according to a new report documenting America’s rank as the world’s No. 1 incarcerator. It urges states to curtail corrections spending by placing fewer low-risk offenders behind bars."
One in 15 African-Americans are jailed in the US.