Why did the Czechs and Slovaks leave Austria Hungary together? (Short Animated Documentary)

Why did the Czechs and Slovaks leave Austria Hungary together? (Short Animated Documentary)
When Austria-Hungary fell apart, many ethnic groups went their own way. The Czechs and the Slovaks, despite never living in a single state before opted to not only leave the empire but to unite into a single country. So why did they do this instead of going their own way? To find out why watch this short and simple animated history documentary.