Horsesense Hank in the Parallel Worlds by Nelson S. Bond

What if Washington hadn't crossed the Delaware? Horsesense Hank found the strange answer when he traveled into the past.

The whole damn thing was Jamieson's fault. He was a snippy sort of somebody, anyway, even if he was head of the U. S. government's physics research department. He liked nothing more than to fling his physical and mental weight around. Because he had an exaggerated amount of the first, and an exaggerated opinion of the second, he riled Hank Cleaver worse than boils on the postscript.