Most of those who wholeheartedly embraced reform and identified themselves as progressives during the late 19th and early 20th century were?

Most of those who embraced reform and identified as progressives during the late 19th and early 20th centuries were middle-class individuals, including professionals, intellectuals, and activists. They were motivated by a desire to address social issues such as poverty, labor rights, women's suffrage, and government corruption. Progressives sought to use scientific principles and expert knowledge to improve society and believed in the power of collective action to bring about change. Their efforts led to significant reforms in various areas, including education, public health, and labor laws.