European governments found ways to pay for expensive wars.There was organization of labor on an international basis. European nations could not pay back their foreign loans.
The answer is primitive, since medical practices were not nearly as advanced as they are today.
I would say true because this was the time of "boom", as we called it.
A lot of mass production and all that ( More making cars, food, and lots more )
After that, however, was around the Great Depression, when lot's of things and people were lost.
Glad I could help, and good luck!