Final answer:
Dorothea Dix, Jane Addams, and Jacob Riis were all prominent social reformers whose efforts contributed to societal improvements during the Progressive Era.
Step-by-step explanation:
Dorothea Dix, Jane Addams, and Jacob Riis were all known as social reformers. These individuals, along with others during the Progressive Era, worked tirelessly to improve societal conditions and promote social justice. They were not muckrakers like Ida Tarbell or Lincoln Steffens, who were journalists uncovering societal ills through investigative writing, nor were they suffragettes, although social reformers did support the suffrage cause. Unlike political leaders who primarily operate within the governmental system, social reformers may influence policy from outside official political roles. Dorothea Dix was instrumental in improving the treatment of the mentally ill, Jane Addams founded the settlement house movement, and Jacob Riis used photojournalism to reveal the harsh realities of life in tenements, prompting public action towards better living conditions.