What caused the greek city-states to become part of the macedonian empire

After the Macedonian Struggle and the Balkan Wars (in 1912 and 1913), the modern Greek region of Macedonia became part of the modern Greek state in 1912–13, in the aftermath of the Balkan Wars and the Treaty of Bucharest (1913).

Explanation:

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it further strained relations between the north and the south and convinced