== German as first language == 

 I have to take exception to the following statement from the article: 

 Because of the multicultural and multilingual history of Central Europe, the population of the German Empire consisted of people with different mother tongues. However 92.5% of the population had German as their first language,... 

 Standard German (which is the language being referred to) is still learned as a second language by many Germans with a local Germanic dialect being their first language.  I imagine at the time of the German Empire rather more Germans were in this position.