From the Gorkha unification to a republic: how the Nepali state took its present shape
Background
An ambitious Gorkha King named Prithvi Narayan Shah conquered the kingdoms of the Kathmandu Valley by 1769 and moved his capital to Kathmandu. The Shah dynasty he established ruled unified Nepal from 1769 to 2008. During the mid-19th century Jung Bahadur Rana became Nepal's first prime minister to wield absolute power, starting a hereditary reign of the Rana Prime Ministers that lasted for 104 years. The Ranas were overthrown in a democracy movement of the early 1950s, and King Tribhuvan was reinstated as the Head of the State. An independent Ministry of Foreign Affairs was established in 1951, in place of the older Munshi Khana. A Constituent Assembly election was held on April 10, 2008. The new constitution of Nepal was promulgated by a vote of the Constituent Assembly on September 20, 2015.
In plain words
Gorkha — The hill kingdom whose ruling house went on to unify Nepal and give the country its royal dynasty.
Munshi Khana — The office that handled Nepal's foreign correspondence before a separate foreign ministry was created.
Constituent Assembly — An elected body whose task is to write a constitution.