> Isn't this description also an assumption? Do you have an example of this? Groups of people who have the same language, but have hard time understanding each

> Isn't this description also an assumption? Do you have an example of this? Groups of people who have the same language, but have hard time understanding each other? There are two obscure tribes found in a remote part of the North American continent in which this phenomenon can be observed. I believe one calls itself ‘the Democrats’ and the other ‘the Republicans’.