As a genre, Alternate-History tends to deal with subjects like "What if ( insert-country-here ) won ( insert-war-here )", "What if ( insert-person-here ) became leader of ( insert-country-here ) instead of ( insert-person here )" and "What if ( insert-event-here ) never happened" among other...
Humans went from flying the first airplane in December 1903, to landing on the moon in July 1969, which is an absolutely insane change in such a short period of time. Naturally, advances in aviation, medicine, computer electronics and consumer goods slowed down, but what if it didn't? What would...