Alternate history is the exercise of looking at the past and asking "what if"? What if some major historical event had gone differently, and how could that have changed the world? Popular "what if" questions that you may have seen in fiction include "what if the Nazis had won the Second World War?" and "what if the South had won the US Civil War?", but it can be just as interesting to think about Aztecs resisting Spanish colonization or a Japan that did not turn its back on the world under the Shogunate. Alternate history is a literary genre, but here we're mainly interested in history itself - and the politics, strategy, culture, and more that define it. We spend most of our time debating our own ideas about history and how it could have gone differently, so this is a community focused on creativity and learning.