How many immigrants fueled labor needs in the U. S. between 1870 and 1915?

More than 15 million immigrants fueled labor needs in the U. S. between 1870 and 1915

Explanation:

The period between 1870 and 1920 was characterized by social and political unrest in most of the European and Asian countries. The first choice of the victims of this unrest was to move to the United States and take safe refuge. Most migrants that fled in during this period chose to work in industries as workers as ample industry jobs were available owing to the growing demand for finished goods from around the world.