The workers went on strike
the electric lightbulb
after a wave of immigration in the mid-1800s.
The name for Tammy Hall is a New York City political machine
He was a robber baron. He worked for the railroads in California. (A robber baron was a business leader who became wealthy through dishonest methods.)
An increase in leisure activities - Apex
Production of goods and many other things changed greatly due to mechanisation and huge improvements in steam power.
The great awakening
A union organized by Eugene V. Debs
By the late 1800s, railroads carried goods just about everywhere, from coast to coast. In rural areas, horse-drawn carriages could still be seen, and some salesmen (they were most always men back then) used this method of transportation. But mostly, Sears (which was then called Sears Roebuck) became known for their successful mail order business. People would receive the Sears catalog, choose what they wanted, write to Sears to let the company know, and the merchandise would be mailed to them.
The creation of Standard Time and time zones.
It could be all of the following or none of the following as I do not see any following hazards.
Shorter workdays