When did Norman Rockwell draw this boy with his puppies?

Here are two clues:

1. In the same year, American mass media was born! (The first commercially-licensed radio station began broadcasting live results of the presidential election).

2. In the same year, women gained the right to vote.

Answer: 1920

Sources:

https://collection.nrm.org/#details=ecatalogue.55968

https://www.mentalfloss.com/article/65436/10-world-shaping-events-happened-1920