The sign Jesus spoke of was he actual wars where nations were battling one another. This was extreme since pretty the whole world was at war. However he did state that the "end" was not yet but it was the beginning of birth pangs which is know to be around nine months. Wherever you read a verse in relation to birth it has something to do with a period of time or date surrounding the number "nine". What does the following verse describe?
"and the serpent disgorged water from its mouth like a river". This is the beginning of birth where the male ensemenates the female if you read it in that sense of the meaning.
So Jesus Christ was "present" around the time period when the outbreak of world wars occured, however the birth of the Kingdom did not take place until the "time of the end". Which time period was this? Was it by chance close to 90 years later? What events took place 90 years later from the time around 1914" hmmmm