Final answer:
Both political parties, Party A and Party B, have supported or created the conditions that led to mass incarceration through policies such as the 'war on drugs' and harsh sentencing.
Step-by-step explanation:
Both political parties, Party A and Party B, have played a role in supporting or creating the conditions that led to mass incarceration. One example of Party A supporting mass incarceration is their focus on the 'war on drugs,' which led to the imprisonment of many individuals for drug offenses. Party B, on the other hand, has contributed to mass incarceration through their emphasis on being tough on crime and their support for harsh sentencing policies. These policies have resulted in disproportionately high incarceration rates, particularly affecting minority communities.