Cover art
Blom, Suzanne Allés. Inca: The Scarlet Fringe. Tor/Forge 2000 (cover art by Lynne Cannoy).

Blom, Suzanne Allés. Inca: The Scarlet Fringe
Divergence: 1527 CE
What if: The Inca empire was not in the midst of civil war when Pizarro launched his invasion.
Comments: This is apparently the first of a trilogy. The author posted on Usenet in April 2005 that the second and third books were in her agent's hands and looking for a publisher.
Published: Tor/Forge 2000 (0312874340BUY); Tor 2001 (081257883XBUY).
Awards: Finalist: 2000 Sidewise Award for best long-form alternate history.