>>216096196
>also yes everybody speaks donutlish
Standard German is not just the capital's dialect declared as the default, it has a relatively long historical development for itself. The written language was heavily influenced by Luther's bible translation, which was influenced by the official language of Meißen, which was influenced by the official language of Prague. The East German dialects were well-suited as a standard, since they were a mix of German dialects grown after the East expansion, and hence diverged less heavily.
The modern pronunciation of standard German came around when the language was introduced into schools in Prussia, so the accent is North German mostly.
>>216097193
The border between the Netherlands and Germany was historically not a language border. You can see that Lower Frankish (aka Dutch) extends into Germany and Lower Saxon (aka Low German) extends into the Netherlands.
Language standards become increasingly important, so nowadays the border is also a language border.