Smith, George Henry. "Take Me to Your Leader"
Divergence: c 1861 CE
What if: The South won the Civil War.
Summary: A scientist from another Earth warns of Russian attack, but the narrator lives in a world where Jeff Davis VI is hereditary president of the CSA.
Published: In Microcosmic Tales: 100 Wondrous Science Fiction Short-Short Stories (eds. Isaac Asimov, Martin H. Greenberg and Joseph D. Olander), Taplinger 1980 (0800852389) and DAW 1992 (0886775329).