The U.S. ranks 1st in prisoners

According to the International Centre for Prison Studies, there are 2,228,424 prisoners in the United States. That is enough to make the United States rank first in that category. The second highest number of prisoners is in China, at 1,701,344.

Chart from ICPS
http://www.prisonstudies.org/highest-to-lowest/prison-population-total?field_region_taxonomy_tid=All

The U.S. ranks first in incarceration

According to the Brookings Institution, in 2013 there were 710 Americans imprisoned for every 100,000 residents. This makes the United States rank first out of thirty-four OECD countries ranked in that category. The average incarceration rate among the OECD nations is 115.

The U.S. ranks 1st in locking people up

According to the International Centre for Prison Studies, the United States has an estimate 716 prisoners per 100,000 population. That is enough to make the United States rank first out of two hundred twenty-three countries ranked in that category.