* Social Activism: All three were deeply involved in social issues of their time.
* Jane Addams was a social reformer and co-founder of Hull House, a settlement house that provided social services to immigrants and the poor in Chicago.
* Mark Twain was a vocal critic of social injustices, especially racism and imperialism, through his writing and public speaking.
* Andrew Carnegie was a philanthropist who dedicated a significant portion of his wealth to building libraries, museums, and other public institutions.
* Critical of the Gilded Age: While their approaches differed, all three were critical of the excesses and inequalities of the Gilded Age, a period marked by rapid industrialization, wealth accumulation by a few, and social problems for many.
* Addams directly addressed the hardships faced by immigrants and the working class.
* Twain satirized the hypocrisy and greed of the wealthy through his writing.
* Carnegie believed in the "Gospel of Wealth", arguing that the wealthy had a responsibility to use their wealth for the betterment of society.
* Impact on American Culture: All three left a lasting impact on American culture.
* Addams is considered a pioneer in the social work movement.
* Twain is one of the most celebrated American authors, known for his wit and social commentary.
* Carnegie's philanthropic legacy continues to shape the landscape of American education, research, and arts.
While they had different backgrounds and approaches, they shared a common commitment to social justice, a critical view of the Gilded Age, and a lasting impact on American culture.