The correct answer to this open question is the following.
You ask us to use the PEE method, so here it is
Point.
I agree with the idea that the rise of nationalist ideas was the most significant consequence of the War of Independence of 1857.
Evidence.
Princes, landlords, and rajas joined together in an attempt to end the British rule in India, which meant they were tired of the oppression and injustices of Great Briant ruling India.
After the fight, the rule of the British company called the East India Company ended. Another nationalistic consequence of the war was that the inconvenient Law of Lapse came to an end too.
Explanation.
After many years of the East India Company overseeing and managing the British interest in India, people decided it was time to rebel against the English presence in the Indian land. It was clear for the Indian people that the only interest of the English crown was to exploit the many raw materials and natural resources of India, not helping the Indian people.
The nationalism ideas generated under the British presence motivated people in India to start the unthinkable under those conditions.