Final answer:
At the turn of the 20th century, the US experienced industrialization, significant immigration, urban growth, and cultural shifts. Positively, there was an increase in mobility, economic opportunities, and political enfranchisement. However, these changes also led to increased social stratification, labor hardships, and Native American displacement.
Step-by-step explanation:
The social, political, economic, and cultural shifts taking place in the US at the end of the 19th century and the beginning of the 20th century included industrialization, immigration from southern and Eastern Europe, urbanization with the growth of cities, and shifts in popular culture and social norms. Some of the positive ways these shifts impacted the US were the expansion of mobility for American people, advancements in the production and economic growth, and political changes like the move toward universal white male suffrage. On the negative side, these shifts resulted in increased social stratification, hardships for factory workers with long hours and low wages, more extreme demands on slaves, and conflicts with Native Americans due to expanding settlements.