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Why did Alexander the Great’s empire break apart after his death?

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Mythological figure — Hellenistic age The figure, who is possibly Dionysus, riding a panther, a Hellenistic opus tessellatum emblema from the House of Masks in Delos, Greece, 2nd century bce.

Alexander the Great’s empire disintegrated following his death in 323 BCE primarily because it lacked a stable foundation beyond his own dynamic personality and leadership. Several critical factors contributed to this collapse:1

Lack of a Clear Heir: Alexander died without appointing a successor. While his generals eventually proclaimed his mentally impaired half-brother, Philip III Arrhidaeus, and his posthumous son, Alexander IV, as kings, both were mere figureheads who were eventually murdered.234
Internal Power Struggles: In the absence of a strong central authority, Alexander’s generals—known as the diadochi—engaged in decades of intense, internecine warfare to seize control of the empire’s vast territories.543
Disparate Nature of the Empire: The empire was vast and composed of highly diverse, often disconnected regions. Alexander had not yet established a cohesive administrative system to hold these territories together, and his death occurred before he could address the challenge of coordinating such a sprawling domain.1
Resentment of Policies: Alexander’s attempts to integrate Persians into the army and administration caused significant friction with his Macedonian officers, who felt their privileged status was threatened.21

Ultimately, the empire proved too large and fragmented to survive without Alexander’s personal command, leading to its division into independent kingdoms ruled by his former generals.24