The death of the sixth Great Mughal Emperor, Aurangzeb Alamgir, on 3 March 1707 at Ahmednagar, marked the beginning of the rapid collapse of the central Mughal Empire. For nearly a century and a half, the Mughal Empire had provided political integration, centralized taxation, and military stability across South Asia. However, Aurangzeb's protracted twenty-five-year military campaign in the Deccan (1681–1707)—often termed the 'Deccan Ulcer'—drained the imperial treasury, exhausted the veteran army, and left northern and central provinces neglected and administratively paralyzed.
Aurangzeb was succeeded by a line of weak, short-lived, and ineffective rulers known to history as the Later Mughals (বাহাদুর শাহ ১, জাহান্দার শাহ, ফাররুখশিয়ার, মহম্মদ শাহ). The imperial court at Delhi devolved into a hotbed of poisonous factionalism among rival noble cliques:
- The Turani Faction: Nobles hailing from Central Asia (Transoxiana), led by figures like Chin Qilich Khan (Nizam-ul-Mulk).
- The Irani Faction: Nobles of Persian origin, including Saadat Khan Burhan-ul-Mulk of Awadh.
- The Hindustani Faction: Indigenous Indian Muslim nobles, led by the infamous Sayyid Brothers (Hasan Ali and Abdullah Khan), known as the 'Kingmakers' (নৃপতিকর্তা), who placed and deposed emperors at will between 1713 and 1720.
Modern historians such as Satish Chandra and Irfan Habib have conclusively demonstrated that the decline of the Mughal Empire was fundamentally rooted in institutional and structural socio-economic crises rather than the mere personal weaknesses of the later emperors:
- The Jagirdari and Mansabdari Crisis: The Mughal administrative and military hierarchy rested on the Mansabdari system. Mansabdars were assigned revenue-yielding lands called Jagirs in lieu of cash salaries. During the late 17th and early 18th centuries, the number of mansabdars increased drastically, but the available crown land reserved for assignment (Paibaqi / পাইবাকি জমি) was exhausted. This severe deficit of unassigned lands (Be-jagiri) led to intense competition and civil war among nobles.
- Excessive Revenue Extraction: To maximize revenue from their short-term jagir assignments, jagirdars squeezed the peasantry mercilessly, demanding as much as 50% to 60% of agricultural produce. Cultivators were left without subsistence, driving them to abandon farming and join rebel armies.
- Agrarian Rebellions: Peasants united under regional, ethnic, and religious leadership to challenge imperial authority. The Jats of the Mathura-Agra belt (led by Gokula, Rajaram, and later Churaman and Badan Singh), the Satnamis of Narnaul, the Bundelas under Chhatrasal, and the Sikhs in Punjab rose in widespread armed revolt, severing Mughal trade routes and shattering imperial legitimacy.
While the Mughal state was crumbling from within, it suffered a catastrophic external blow from the ruler of Persia, Nadir Shah Afshar. Viewing the political paralysis of Delhi and seeking vast wealth to finance his own Central Asian military ambitions, Nadir Shah crossed the Khyber Pass and marched into the Punjab plains in early 1739.
- The Battle of Karnal (24 February 1739): Nadir Shah's disciplined, musket-armed cavalry met the disorganized Mughal imperial army under Emperor Muhammad Shah 'Rangeela' at Karnal (Haryana). In less than three hours, the Mughal army was routed; premier noble Khan-i-Dauran was mortally wounded, and Nizam-ul-Mulk negotiated a temporary truce.
- The Carnage in Delhi (Qatl-e-Aam): Nadir Shah entered Delhi alongside the captive Mughal Emperor. When a false rumor circulated in the city that Nadir Shah had been assassinated, local citizens attacked Persian soldiers. Enraged, Nadir Shah unsheathed his sword at the Sunehri Masjid in Chandni Chowk and ordered an indiscriminate massacre (Qatl-e-Aam / কতল-ই-আম). Over 30,000 men, women, and children were butchered in a single day (22 March 1739).
- The Plunder of Imperial Treasures: Nadir Shah stripped Delhi of centuries of accumulated imperial wealth. He looted an estimated ₹70 crore in cash, jewels, gold, and silver. Among the looted treasures were the legendary Koh-i-Noor diamond (কোহিনূর হীরা) and Emperor Shah Jahan's jewel-encrusted Peacock Throne (তখত-ই-তাউস / Takht-i-Taus). The loot was so immense that Nadir Shah suspended all taxation in Persia for three full years.
Following Nadir Shah's assassination in 1747, his Afghan military general, Ahmad Shah Abdali (Durrani), founded the modern state of Afghanistan. Between 1748 and 1767, Abdali launched eight devastating invasions into northern India:
- He repeatedly plundered the Punjab, Delhi, Mathura, and Agra, annexing Punjab, Kashmir, and Multan to the Afghan empire.
- Mughal emperors became helpless puppets, forced to recognize Abdali's suzerainty and appoint his Rohilla Afghan ally, Najib-ud-Daulah, as the supreme military commander (Mir Bakhshi) of Delhi.
- Abdali's relentless incursions eliminated the last vestiges of central Mughal military power in North India, culminating in the titanic clash with the Maratha Confederacy at the Third Battle of Panipat (1761).