Sargent, Pamela. "The Sleeping Serpent"
Divergence: 1241 CE
What if: The Mongols conquered mainland Europe and crossed the Atlantic.
Summary: Led by the son of the khan of France, the Iriquois federation moves to drive the English out of New England.
Published: In Amazing Stories, January 1992; What Might Have Been? Volume 4: Alternate Americas (eds. Gregory Benford and Martin H. Greenberg), q.v.; and The Mammoth Book of Alternate Histories (eds. Ian Watson and Ian Whates), q.v.