Answer and Explanation:
Prithvi Narayan Shah is the unifier of Nepal, because the unification only took place, in fact, after the military campaign he established, this campaign being responsible for finally uniting the various kingdoms that stretched across Nepal's territory.
Prithvi Narayan Shah's campaign was very aggressive and violent, causing immense losses to all the kingdoms, but he managed to annex the kingdoms with an admirable feat, within this campaign, we can highlight the battle where he managed to conquer the kingdom of Mandala, being one of the most important in the region and where it was established that unification was something palpable.