brandenburgisch
Brandenburg
Refers to the German federal state of Brandenburg, its inhabitants, or its culture.
Die brandenburgische Seenplatte ist ein beliebtes Urlaubsziel.
The Brandenburg lake district is a popular holiday destination.

Brandenburg / Brandenburgian
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Brandenburg
Refers to the German federal state of Brandenburg, its inhabitants, or its culture.
Die brandenburgische Seenplatte ist ein beliebtes Urlaubsziel.
The Brandenburg lake district is a popular holiday destination.

Adjectives that refer to geographic places are often formed with the ending '-isch' (-ian/-ic). 'Brandenburgisch' derives directly from the federal state 'Brandenburg'.
Die brandenburgische Landesregierung hat ihren Sitz in Potsdam.
The Brandenburg state government is based in Potsdam.
A common mistake: Geographic adjectives ending in '-isch' are always written in lowercase. So you write 'der brandenburgische Dialekt' (the Brandenburgian dialect) and not 'der Brandenburgische Dialekt'.
Viele brandenburgische Städte haben einen historischen Stadtkern.
Many Brandenburg towns have a historic town center.
You can tell whether the dialect is meant from signal words in the sentence. In that case, 'brandenburgisch' usually appears together with nouns such as 'Akzent' (accent), 'Dialekt' (dialect), or 'Mundart' (regional dialect).
Man hört bei ihm noch den typisch brandenburgischen Einschlag.
You can still hear a typically Brandenburgian touch in the way he speaks.
Prussian
'preußisch' and 'brandenburgisch' can be confused because Prussia and Brandenburg are historically and geographically connected. However, 'preußisch' refers to historical Prussia or to qualities associated with it, such as strict order and a sense of duty. 'brandenburgisch' refers to the present-day German federal state of Brandenburg, its people, culture, or language. When it is about history, 'preußisch' can fit. When it is about the present-day region of Brandenburg or its dialect, 'brandenburgisch' is more precise.

Der Lehrer erklärt im Unterricht einige brandenburgische Ausdrücke.
The teacher explains some Brandenburgian expressions in class.
Im Museum sehen wir alte preußische Uniformen.
In the museum, we see old Prussian uniforms.