America is different from the rest of the world in lots of ways, many of them good. One of the bad ones is its willingness to lock up its citizens (see our briefing). One American adult in 100 festers behind bars (with the rate rising to one in nine for young black men). Its imprisoned population, at 2.3m, exceeds that of 15 of its states. No other rich country is nearly as punitive as the Land of the Free. The rate of incarceration is a fifth of America's level in Britain, a ninth in Germany and a twelfth in Japan.
Tougher than thou
Some parts of America have long taken a tough, frontier attitude to justice. That tendency sharpened around four decades ago as rising crime became an emotive political issue and voters took to backing politicians who promised to stamp on it. This created a ratchet effect: lawmakers who wish to sound tough must propose laws tougher than the ones that the last chap who wanted to sound tough proposed. When the crime rate falls, tough sentences are hailed as the cause, even when demography or other factors may matter more; when the rate rises tough sentences are demanded to solve the problem. As a result, America's incarceration rate has quadrupled since 1970.
Similar things have happened elsewhere. The incarceration rate in Britain has more than doubled, and that in Japan increased by half, over the period. But the trend has been sharper