the United States went through multiple drastic transformations between 1870 and the eve of the First World War. Some of these changes include: industrialization, immigration, imperialism, and reform.

, the United States went through multiple drastic transformations between 1870 and the eve of the First World War. Some of these changes include: industrialization, immigration, imperialism, and reform.

Please briefly describe the significance of each of these changes.

Which change do you think was the most impactful and why?