An Axis victory in World War II is probably the most common use of this plot device in contemporary alternate-history SF.
American Civil War | Vietnam War | American Revolutionary War | World Cup | Cold War | Iraq War | FIFA World Cup | World Trade Center | World Series | War of 1812 | Spanish Civil War | 2010 FIFA World Cup | World Bank | World Health Organization | Korean War | Guinness World Records | 1978 FIFA World Cup | World Series of Poker | Allies of World War II | English Civil War | BBC World Service | Gulf War | ATP World Tour 250 series | Franco-Prussian War | World Heritage Site | World Boxing Association | World Boxing Council | 2006 FIFA World Cup | Pacific War | war |