The classical era — Prithvi Narayan Shah (reigned 1743–1775): unification (1768 Kathmandu) created a Himalayan state between two empires. His Divya Upadesh's immortal image — Nepal as "a yam between two boulders" — prescribed friendship with the Chinese emperor and careful management of the southern (British) power: the founding document of Nepali balance-of-power statecraft.
The Anglo-Nepal War and Sugauli (1814–1816): over-expansion met the East India Company; the Treaty of Sugauli (1816) ceded Kumaon-Garhwal, Sikkim and much of the Terai, admitted a British Resident, and fixed the Mechi–Mahakali boundaries — but Nepal retained independence (never a colony), the fact that organizes all later policy. War's lesson: capacity limits; peace's compensation: the Resident era's cautious engagement.
The Rana century (1846–1950): Jung Bahadur's Britain-tilted alignment (military aid to Britain in 1857 earning the returned Terai districts; the 1855–56 Tibet campaign and Thapathali treaty), studied isolation (barring foreigners), and the crowning achievement of the era: the Treaty ofPerpetual Peace and Friendship with Britain (1923), recognizing Nepal's full sovereignty and independence — the first great-power charter of Nepali statehood. WWII's Gurkha service; then 1947: British withdrawal from India collapsed the patronage structure.
The transition and the twin treaties (1947–1960): Rana fall and Delhi Compromise (1951); the 1950 Treaty of Peace and Friendship with India (Unit 7); UN membership (14December 1955) — the passport to the world; diplomatic relations with the People's Republic of China (1955); the 1960 Peace and Friendship Treaty with China and the boundary settlement (1961–63) — the northern anchor; aid from all directions (US since the 1950s; the 1950s' Colombo- era assistance).
The Panchayat decades (1960–1990): King Mahendra's and Birendra's "balanced" internationalism — non-aligned founding activism (NAM's 1961 Belgrade founding; hosting its 1986? ministerial and chairing the NAM's standing committees), Zone of Peace proposal (1975: King Birendra at the Non-Aligned Colombo summit proposing Nepal internationally recognized as a zone of peace — endorsed by well over a hundred states, but never by India, the key audience), SAARC's genesis (King Birendra's South Asian cooperation advocacy bearing fruit at the 1985 Dhaka founding), and the fatal friction: the 1988 China arms purchase coinciding with treaty- renewal disputes → the 1989–90 Indian trade-transit impasse (India's refusal to renew the combined trade-and-transit treaties; a 13-month economic squeeze) — contributing to the 1990 People's Movement's triumph.
The democratic decades (1990–2008): the 1990 Constitution's treaty provisions and foreign policy democratization (parliament's role, Article 279's lineage); the Mahakali Treaty with India(1996) — integrated river development (Pancheshwar), ratified amid landmark public debate; economic openness and aid dependence; the Maoist conflict (1996–2006) internationalizing human-rights scrutiny; the 2005 royal takeover's isolation, then the 2006 peace process with UN engagement (UNMIN) — Nepal as the UN's peace process client.
The republic (2008–present): republic, federalism, the 2015 Constitution; the 2015–16 borderobstruction during the constitutional transition (fuel-medicine crisis) re-teaching the dependency lesson and propelling diversification: transit agreements with China (2016; protocol 2019 opening Chinese ports), Bangladesh (Chittagong/Mongla access agreements), the Belt and Roadframework agreement (2017); the Kalapani–Lipulekh–Limpiyadhura dispute with India
(India's 2019 map and 2020 road; Nepal's new political map (June 2020) incorporating the north- western territory, constitutionalized by amendment — a rare unanimous-era constitutional moment); the Millennium Challenge Corporation compact with the USA (US$500 million,signed 2017, ratified by Parliament February 2022) after a geopolitics-soaked domestic debate; COVID-era repatriation and vaccine diplomacy; and the current line: "balanced ties" — engaging India, China, the USA, the EU, the Gulf and global institutions simultaneously, with economic diplomacy as the declared core.
The essay line that carries the answer: from a yam's survival, through treaty-anchored sovereignty, to a federal republic's economic diplomacy — Nepal's foreign policy has one constant (sovereignty) and one evolution (from avoidance to engagement).