Which reform was advocated by Theodore Roosevelt and later established by Taft?

The reform advocated by Theodore Roosevelt and later established by William Howard Taft was the regulation of corporations and the strengthening of antitrust laws. Roosevelt emphasized the need to curb corporate monopolies and protect public interests, which laid the groundwork for Taft’s administration to more vigorously enforce the Sherman Antitrust Act. Taft's focus on antitrust actions led to significant legal cases against major corporations, continuing Roosevelt's progressive legacy in regulating big business.