America didn't sign the Treaty of Versailles surrender document on 28th June 1919, St Vitus Day.
Please look at very top of this link and read "came into force with the exchange of ratifacations at Berlin on 11th November 1921"
These mystics do love numerology don't they?
US - Germany Peace Treaty - Wikisource
Numerology is used the world over....everyone wants to do bussiness with China, they love the number 8.....thus is why The Beijing Olympics started on 8/8/2008!
Below is a link explaining Chinese customs for American businessmen please scroll down link to "Numerology" and read down:-
China's Changing Culture and Etiquette--CBR July-August 2008