How did ancient greek civilization end

A large war happened: the Peloponessian Wars (431 to 404 BC). Athens and Sparta went to war then their allies joined in. After many long bloody years, Sparta finally won and there were years of peace. But Sparta was severely weakened. Then Athens revolted. There was no unity among the city-states and Sparta had lost much of its empire. In 338 BC, the Macedonians under Philip II and his son Alexander conquered Greece, and the subsequent empires were eventually subsumed by Rome between 149 and 146 BC.