The Delhi Sultanate expanded rapidly under Muhammad-bin-Tughlaq; constant wars soon emptied their treasury.
The rulers of the Delhi Sultanate acquired power with sword and fire. So, there was no definite law of succession, and the raids from the Mongols were always a threat.
The throne was sustained only by military strength and this became a source of political instability. Some of the nobles were more powerful than weak Sultans and local rulers continuously asserted their independence.
It was the Iqtadari, Zamindari and Jagirdari systems that led to the disintegration of the Delhi Sultanate. Peasants lived in a permanent state of poverty, while kings and nobles lived in great splendour. This alienated the common people from their rulers.
The invasion by Babur brought down a Sultanate that was already in ruins.
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