Seabury, Paul. "The Histronaut"
Divergence: 1917 CE
What if: Lenin did not return to Russia from Switzerland.
Summary: A time traveler destroys Lenin's train, but returns to his home time to find Washington, DC, occupied by Germans.
Published: In The Magazine of Fantasy and Science Fiction, April 1963.
Original in: English.
Translation: French by Michel Demuth as "L'historionaute", in publ. unknown.