World War I, which lasted through Jul 28, 1914 to Nov 11, 1918.
https://www.history.com/topics/world-war-i/world-war-i-history
Info at the link
It gave women work because of all the lives lost
Many people were mining for gold, silver, and oil during the 1800s to gain wealth and fame. So there were definitely many miners during the 1800s. Many people needed to put their valuables in banks. So there were also a lot of bankers, doctors, lawyers, ministers, and many other "White Collar" jobs.
An empire is an aggregate of many separate states or territories under a supreme ruler or oligarchy.
And Rome or Italian Roma is a city in and the capital of Italy, in the central part, on the Tiber.
So basically, Rome is also an empire, you can call it the Roman Empire.