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Mass Incarceration in the US

Sep 1, 2025

Overview

This lecture reviews the historic rise, underlying causes, and far-reaching effects of mass incarceration in the United States, highlighting demographic disparities, key policy drivers, and ongoing reforms and challenges.

The Scale and Growth of Mass Incarceration

  • Over five million people are under criminal system supervision in the US, with nearly two million in prisons and jails.
  • The prison population rose from 360,000 in the early 1970s to a peak in 2009, a seven-fold increase.
  • The US has one of the highest incarceration rates globally, far exceeding Canada and Mexico.
  • Prison population began declining in 2010, with a 14% drop in 2020 during COVID-19, but rose again by 2% in 2022.

Causes and Consequences

  • Policy changes, not crime rates, drove the growth in incarceration.
  • Mass incarceration negatively affects physical, mental, and economic health of individuals, families, and communities.
  • Children of incarcerated parents face significant declines in education and health.
  • High incarceration undermines community networks and trust in law enforcement.

Probation, Parole, and Offense Types

  • Numbers and duration of probation and parole have increased over recent decades.
  • In 2022, 63% of state prisoners were convicted of violent offenses, up from 30% in 1970.
  • Nearly half of federal prisoners are incarcerated for drug offenses.

Racial and Ethnic Disparities

  • Nearly 7 in 10 prisoners are people of color; one in five Black men born in 2001 are expected to be imprisoned.
  • Black adults have a significantly higher risk of imprisonment than other groups.
  • Disparities are even greater among those serving life or long sentences.

Sentencing Policies and Reforms

  • Mandatory minimums, three-strikes, and harsh drug laws (e.g., Anti-Drug Abuse Act, Sentencing Reform Act) worsened disparities and sentence lengths.
  • Crack vs. powder cocaine sentencing led to greater racial disparities.
  • The Fair Sentencing Act (2010) and First Step Act (2019) reduced some sentencing disparities and enabled retroactive relief.

Women and Youth in the System

  • Women's prison population increased over 17-fold since 1970, now over 82,000; recent growth outpaces men.
  • The number of youth in adult prisons declined 83% from 2000 to 2021, but rose sharply in 2022.
  • Transferring youth to adult court increased risks and recidivism without public safety benefit.

Life and Long-Term Sentences

  • One in seven prisoners is serving a life sentence; numbers of life without parole (LWOP) sentences have greatly increased.
  • Many prisoners serve over a decade; long sentences offer diminishing public safety returns.
  • Black Americans are overrepresented among those serving 10+ years and LWOP.

Voting Rights

  • Felony convictions result in loss of voting rights in 48 states, affecting over 4.4 million Americans.
  • Disenfranchisement rates are highest among African Americans at nearly 5%.

Lessons Learned

  • Policies driven by moral panic and flawed theories (e.g., superpredator) were counterproductive.
  • Addressing structural inequalities, investing in prevention, and focusing on restoration over punishment can reduce mass incarceration.

Key Terms & Definitions

  • Mass incarceration — The large-scale imprisonment of the population, especially since the 1970s, due to policy choices.
  • Mandatory minimums — Laws requiring fixed minimum sentences for certain crimes.
  • Life without parole (LWOP) — A sentence where the individual is never eligible for release.
  • Probation — Court-ordered community supervision in place of incarceration.
  • Parole — Conditional early release from prison under supervision.
  • Disenfranchisement — Loss of voting rights due to a felony conviction.

Action Items / Next Steps

  • Review figures and charts on prison population trends, disparities, and offense types as referenced in the lecture.
  • Reflect on the impact of sentencing policies on communities and consider policy alternatives for reform.