What geographic feature prevented the mughal empire from expanding further to the north

The correct answer here is the Hindu Kush and the Himalayas Mountains.

Explanation:

The Mughal Empire was an empire on the Indian subcontinent that existed from 1526. until its dissolution in  1857. The north borders of the empire were the Hindu Kush mountains and the Himalayas Mountains. These two massive geographical obstacles prevented the empire form expanding further north as they were almost impossible to cross with large armies.

pretty sure they split up because of religious conflicts.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.