Answer:
✔️years of war
Step-by-step explanation:
What actually led to the weakening of the kingdoms of ancient India is "years of war".
The Gupta Empire, an ancient India Kingdom fell to Hun invaders during the reign of Kumaragupta. This took place from the point when they began falling apart internally. The Hun invaders caused significant damage to the Gupta Empire and led to the weakening of the kingdom and eventual end of the empire in 550 CE. Series of invasions came from the east, west and north and led to the disintegration into regional kingdoms.
The years of war experienced by Ancient India led to the weakening of the kingdoms of ancient India.