Answer:
B. There was an increase in immigration to the nation.
Step-by-step explanation:
The rapid industrialization in the late 1800s made the United States one of the wealthiest countries in the world, with a huge territory, and many cities were hundreds of manufacturing companies were established every year.
This attracted large waves of immigration, that peaked in this same period. Hundreds of thousands of immigrants from Germany, Ireland, Italy, Scandinavia, and Eastern Europe settled in the United States in this time, many of them settling in the industrial cities of the north.