Muchrackers contributed to the rise of Progressivism in the early years of the 20th century by

Their exposes of government and business corruption, abuse, and mismanagement led to widely supported public demands for effective reform.

Explanation:

The muckrackers is a term that was given to investigative journalists whose purpose is to expose the corrupt government and business practices between 1890s–1920s.

Their works contributed to the waves of activisms during the progressive era which led to the creation of various legislations to regulate the private sectors.

Much ackers strongly contributed to the passing of legislations such as Minimum wage law, Child labor prohibition, Guidelines to fix unsafe working condition, and tax reforms to target dishonest corporations.

the answer is migration

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.