Final answer:
Progressivism peaked during the early 20th century and was marked by significant social reforms, such as addressing working conditions and monopolies, with the presidency of Theodore Roosevelt and Woodrow Wilson. Major accomplishments included antitrust legislation, income tax (16th Amendment), and women's suffrage (19th Amendment).
Step-by-step explanation:
Progressivism's Zenith and Major Accomplishments
Progressivism reached its zenith during the first two decades of the 20th century. Idyllically, its peak years are often identified as the time when Theodore Roosevelt and Woodrow Wilson served as presidents, starting roughly from 1901 with Roosevelt's ascendancy to the presidency and ending around Wilson's 'New Freedom' legislation in 1916. A major accomplishment of the Progressive Era was the establishment of various social reforms aimed at addressing the ills of a rapidly industrializing society, such as poor working conditions, monopolies, and corruption. These reforms included measures like the Sherman Antitrust Act and the establishment of the Federal Trade Commission to monitor and prevent unfair business practices.
Further significant achievements include the passage of the 16th Amendment, which allowed the federal government to collect an income tax, and the 19th Amendment, granting women the right to vote. The Progressives played a crucial role in promoting public health initiatives, improving urban living conditions, and advocating for labor legislation that limited working hours and prohibited child labor.