Final answer:
Gender differences in aggression in the U.S. show that males are the majority of prisoners, influenced by significant racial disparities in incarceration rates. The U.S. criminal justice system has expanded over the past century, leading to the country having the highest incarceration rate in the world.
Step-by-step explanation:
Gender differences in aggression, as seen in the United States, are marked by statistics showing that males comprise a significant majority of prisoners. Specifically, issues such as racial disparities play a major role in the rates of imprisonment, with black men being almost six times as likely to be incarcerated as white men and Hispanic men more than twice as likely. The criminal justice system has seen a growth in the incarceration rate in the past century, with a peak in 2007, although numbers have started to decline more recently. It is important to note that while the United States has just about 5% of the world's population, it holds approximately 25% of the world's prison population, which highlights the vast scale of its criminal justice system.