The steam engine is one of them..
Answer:
Unemployment
Explanation:
In India people did not have jobs because of the population new that corona came the crisis grew bigger leaving more people without a job.
This site might help you find the answer.
https://sites.google.com/a/pitt.k12.nc.us/world-history-wwii-online-textbook/rise-of-european-dictators
Maybe because of the popularity of television, or because people felt they needed it in their household for entertainment
