The 18th century in India was a watershed period characterized by the rapid disintegration of the once-mighty Mughal Empire and the consequent emergence of fragmented regional states. This domestic political instability and institutional decay left the Indian subcontinent highly vulnerable to external aggression. The devastating invasion of the Persian ruler Nadir Shah's Invasion of India (1739) The Turning Point of Mughal Decline and the repeated campaigns of the Afghan chief Ahmad Shah Abdali and the Repeated Afghan Invasions of India shattered the last vestiges of imperial authority in Delhi.
For the UPSC Civil Services Examination, understanding why these foreign invaders succeeded is not merely a study of military battles, but a deeper exploration of the structural rot—spanning administrative, military, economic, and political spheres—that had set into the Mughal state.
Administrative weakness
The administrative machinery, which had been the backbone of the Mughal Empire under Akbar and Aurangzeb, collapsed in the 18th century due to structural inefficiencies and the incompetence of the Later Mughals.
- Incompetence of the Later Mughals: Rulers like Muhammad Shah "Rangeela" (1719–1748) and Ahmad Shah Bahadur (1748–1754) lacked the statesmanship and military acumen required to govern a vast empire. Their preoccupation with court luxuries and neglect of state affairs paralyzed central decision-making.
- Neglect of the North-Western Frontier: The Mughals traditionally maintained a secure grasp on the Kabul-Qandahar line to protect the empire's gateways. Under the Later Mughals, frontier administration was completely neglected. The governors of Kabul and Ghazni (such as Nasir Khan) were not provided with the necessary funds to pay their troops or maintain border garrisons. The mountain passes were left virtually unguarded, allowing Nadir Shah and Abdali to march into the plains of Punjab unopposed.
- Decay of the Mansabdari and Jagirdari Systems: The Mughal administration relied on these twin systems to mobilize resources and troops. In the 18th century, the number of Mansabdars increased dramatically without a corresponding increase in the availability of land (be-jagiri crisis). As a result, Mansabdars could not maintain their mandated troop quotas, and the local administration deteriorated into corruption and chaos. For more details on this crisis, refer to Jagirdari Crisis and the Collapse of Mughal Administration.
- Factionalism in the Nobility: The Mughal court became a hotbed of intrigue, divided into warring factions: the Turanis (Central Asian origin), Iranis (Persian origin), and Hindustanis (Indian Muslims). Rulers were reduced to puppets of these factions (such as the Sayyid Brothers as "Kingmakers"). Courtiers prioritized their narrow factional interests over the collective defense of the empire. For instance, during Nadir Shah's invasion, factional rivalries between Nizam-ul-Mulk (Turani) and Saadat Khan (Irani) prevented a coordinated military response at the Battle of Karnal.
- Collapse of the Intelligence Network: The Mughal intelligence apparatus, consisting of Waqia-navis (news writers) and Sawanih-nigar (intelligence agents), had completely collapsed. The central court in Delhi remained oblivious to the advance of Nadir Shah’s army until it had reached Lahore, giving the state no time to prepare defenses.