I apologize for not meeting the expected level of quality earlier. I will attempt again:

Berlin is a city in Germany, located east of the river Elbe. The first settlements in the area are believed to date back to 1174, based on archeological digs where a wooden house was unearthed. Although located in Germany, during that time period the people inhabiting the areas east of river Elbe were slavic, not germanic. In this sense, one could argue that berlin was first established by slavs. 

However, it is quite a bit more complicated to definitely answer who made berlin, as several different historical events contributed to the formation of the city that is known today. This includes the merging of multiple older towns and settlements. For example, even though the first recognized towns in the area were Spandau (established 1197) and Köpenick (established 1209), those were not merged into Berlin until 1920.

A more definitive answer can be reached by considering the merging of the towns of Cölln and Altberlin as the event that created Berlin. This was done in 1710 by Frederick I of Prussia, and as such one could argue that Berlin was made by Prussians.
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