U.S. has most people in prison of any country despite crime rates declining 25%

Which country in the world has the most people in prison?

You might think it would be China (with 1+ billion people and a restrictive government) or former Soviets still imprisoned in Russia.

Wrong. The United States has the most people in prison by far of any country in the world. With 5% of the world's population, we have 25% of the world's prisoners – 2.3 million criminals. China with a population 4 times our size is second with 1.6 million people in prison.

In 1972, 350,000 Americans were in imprisoned. In 2010, this number had grown to 2.3 million. Yet from 1988 – 2008, crime rates have declined by 25%.

Isn't anyone in the liberal media interested in why so many people are in prison when crime has dropped? WTF "liberal media"?

Source: Wikipedia/Justice Policy Institute Report.