Glimpsing the culture of the era adds an understanding of events in, fashion, technology, music, architecture, politics and lifestyle during that period of time in history. We can then imagine what the daily life and sentiment of the people in the letters might have been.
Click here for more information on Culture in the United States 1930-1939
These links have a wealth of interesting information!
Click here for more information on Culture in the United States 1940-1949
One of the major events of the era was the New York Worlds Fair of 1939–1940. It was the first exposition to be based on the future, with an opening slogan of "Dawn of a New Day", and it allowed all visitors to take a look at "the world of tomorrow".
I have duplicated a few 1939 New York Worlds Fair Postcards from my archives.