Malzberg, Barry N. "Ship Full of Jews"
Divergence: 1492 CE
What if: Columbus carried several hundred deported Jews along during his first voyage.
Summary: Columbus argues with a rabbi about conditions below decks. Meanwhile, over on the Santa Maria, Torquemada plots.
Published: In Omni, April 92; What Might Have Been? Volume 4: Alternate Americas (eds. Gregory Benford and Martin H. Greenberg), q.v.; and In the Stone House, q.v.