Well that is interesting, he hadn't met anyone further in the future than he is. Well César maybe, considering his knowledge of technology, but he hadn't inquired when he was from.

"Interesting. In mine there was a giant war in 2045 that decimated a lot of things, and did destroy many factories. What caused yours?"

Because in his it was Omnics. Not him, he's not a military unit, but more tactical war centered Omnics who murdered tens of millions of people before being put down.