https://www.census.gov/history/www/through_the_decades/fast_facts/1880_fast_facts.html
https://en.wikipedia.org/wiki/1880s
The 1880s was a decade that began on January 1, 1880, and ended on December 31, 1889. The decade occurred at the core period of the Second Industrial Revolution. The modern city as well as the sky-scraper rose to prominence in this decade as well, contributing to the economic prosperity of the time. The 1880s were also part of the Gilded Age, in the United States, which lasted from 1874 to 1907
"However, the Gilded Age was also an era of abject poverty and inequality as millions of immigrants—many from impoverished regions—poured into the United States, and the high concentration of wealth became more visible and contentious."