How did the Macedonian Seleucid Empire decline and fall?

The Macedonian Seleucid Empire, founded by Seleucus I Nicator, was one of the most powerful empires of the ancient world. However, it eventually declined and fell due to a variety of factors.

One of the main reasons for the decline of the empire was internal strife and conflict among the ruling class. This weakened the empire and made it vulnerable to attacks from external enemies.

Another factor was the rise of powerful neighboring empires, such as the Parthian and Roman empires, which challenged the Seleucids for control of territory and resources.

The Seleucid Empire also faced financial difficulties, including an unsustainable tax system and overspending on military campaigns and luxury goods.

Finally, the empire suffered from a lack of strong leadership and a decline in military power, which made it unable to effectively defend itself against external threats.