Tunnel Thru the Air or Looking Back from 1940

The Tunnel Thru the Air is a fascinating, mysterious romance founded on facts. It gives a forecast on the 1928 Presidential election and some valuable hints on how future cycles on Stocks, Cotton and Wheat will run up to 1932. In fact if you delve deeper you will find many hidden market secrets in this book. How did Gann know in 1928 that 1940 would see a war involving the US, Great Britain and Japan?