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"The new high of 2,019,234, announced by the Justice Department in April, underscores the extraordinary scale of imprisonment in the United States compared with that in most of the world."

" A major cause of the increase is the war on drugs. In 1980, says Marc Mauer, assistant director of the Sentencing Project in Washington, about 40,000 Americans were locked up solely for drug offenses. Now the number is 450,000, three-fourths of them black or Hispanic, although drug use is no higher in those groups than among whites."
-- www.commondreams.org/headlines03/0601-01.htm

450,000 out of over 2 million is about 22% -- not even close to your "most".