Why did the Macedonian Empire Collapse?

Why did Alexander the Great's empire fall?

After Alexander's death in 323 BC, the ensuing wars of the Diadochi, and the partitioning of Alexander's short-lived empire, Macedonia remained a Greek cultural and political center in the Mediterranean region along with Ptolemaic Egypt, the Seleucid Empire, and the Kingdom of Pergamon. Powerful people were involved in conflicts for control over these territories.

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