Final answer:
The Hull House, founded by Jane Addams in Chicago in 1889, was the most famous settlement house and played a key role in social reform movements.
Step-by-step explanation:
The most famous settlement house was the Hull House, founded by Jane Addams in Chicago in 1889. Jane Addams was a pioneer, not only in the establishment of Hull House but also in the broader settlement house movement which spread across the United States. Settlement houses like Hull House provided various services to improve the lives of the working class, including childcare, educational classes, employment assistance, legal aid, and health care clinics. The settlement house movement had a significant impact on social reform, influencing developments in housing laws, child labor laws, worker's compensation laws, and was also linked to other progressive movements such as women's suffrage and antiwar efforts during World War I.