Final answer:
The period from 1880 to 1915 is known as the Progressive Era in American history, marked by social and political reform movements.
Step-by-step explanation:
The period from 1880 to 1915 is commonly referred to as the Progressive Era in American history. This period was characterized by widespread social and political reform movements aimed at addressing issues of inequality, corruption, and social injustice. It saw significant advancements in areas such as labor rights, women's suffrage, and regulation of big business.