The recipients of the 2014 Sidewise Awards for Alternate History were announced at Loncon 3 on August 16.

Short Form
“The Weight of the Sunrise” by Vylar Kaftan

Long Form
(tie)
The Windsor Faction, by D. J. Taylor
Surrounded by Enemies: What If Kennedy Survived Dallas? by Bryce Zabel

[Thanks to Steven H Silver for the story.]