It probably was as lots of new technology had been invented then.
We are in the 21st Century.
The 1900s aka the 20th Century.
it went from 1900 to 1999 it was a span of 100 years which is also known as a century.
The most common were: cancer (in all it's forms), cardio-vascular disease (including hypertension), lung disease (in all it's forms), diabetes, connective tissue disease (artheritis, gout, etc.)...