Final answer:
Wisconsin Senator Robert M. La Follette focused on Progressive reforms during the early 1900s, introducing the Wisconsin Idea and supporting public welfare legislation, direct senatorial elections, and women's suffrage.
Step-by-step explanation:
In the early 1900s, Wisconsin Senator Robert M. La Follette was most concerned with Progressive reforms aimed at increasing government oversight and addressing issues of public welfare. As governor of Wisconsin, La Follette championed the Wisconsin Idea, introducing groundbreaking legislation such as the first workman's compensation system, a minimum wage law, and a progressive tax system.
He also supported the direct election of U.S. senators and advocated for women's suffrage. His commitment to reform continued in his tenure as a U.S. senator, reflecting his deep influence by the Progressive Movement. La Follette's efforts were geared towards curbing the power of corporations and making the capitalist system more responsive to public interests and human needs.