The Lost Continent by Edgar Rice Burroughs was originally published under the title Beyond Thirty - https://www.gutenberg.org/cache/epub/149/pg149-images.html

 Since earliest childhood I have been strangely fascinated by the mystery surrounding the history of the last days of twentieth century Europe. 

Then came the fruition of that historic propaganda which is best described by its own slogan: “The East for the East—the West for the West,” and all further intercourse was stopped by statute.

I was born in Arizona, in the United States of North America, in the year of our Lord 2116. Therefore, I am twenty-one years old.