What term refers to the legislative changes aimed at providing social welfare in the early 20th century?

The term you're looking for that refers to the legislative changes aimed at providing social welfare in the early 20th century is the "Progressive Amendments." This designation encompasses various measures during the Progressive Era, primarily spanning from the 1890s to the 1920s, where reforms were enacted at national and state levels to address social issues and inequalities. Initiatives included the establishment of the income tax, women's suffrage, and labor rights, all of which were integral to enhancing social welfare for various population segments.

These amendments are rooted in the belief that government should play a pivotal role in addressing the needs of its citizens and rectifying social injustices. This period emphasized the importance of social reform in politics and the economy.

The other options, while significant historical phases or legislation related to social welfare, pertain to different contexts. The New Deal was a response to the Great Depression in the 1930s, focusing on recovery and reform. The Great Society refers to a set of domestic programs initiated by President Lyndon B. Johnson in the 1960s, aimed at eliminating poverty and racial injustice. The Social Security Act specifically pertains to legislation passed in 1935 that created a social insurance program designed to provide financial assistance to the elderly