The discovery of the Time Flux Generator was the greatest scientific find in the past 2 milleia. It also sparked off a war greater then anything ever seen on the face of the earth. With the discovery of space/time travel poeple took it in their own hands to go back and set things right. Unfortunatly the times that were being changed were none to pleased about that. Entrepenures and millitary contractors alike saw the profit in arming these other time periods. The very nature of the Flux Generator eliminated all paradox, since it was discovered it worked by bending reality, not space/time.
It was the technological peak of humanity.
It was a war spanning 4000 years of time.