Discuss how the rise of Chinese nationalism in the 1920s challenged the system of unequal treaties.

The "unequal treaties" began with the Treaty of Nanking (1842). They forced treaty ports, foreign concessions, extraterritoriality and fixed tariffs on China. In the 1920s, a nationalism that joined mass protest with a revived Kuomintang (KMT) turned these privileges from settled rights into contested burdens.

Roots of the nationalist upsurge

• May Fourth Movement (1919): anger at the Versailles decision to hand Shandong to Japan made ending the treaties a popular cause and not only an elite one.
• Sun Yat-sen's Three Principles and the KMT–Communist United Front gave nationalism a party, an army and an openly anti-imperialist programme.
• Warlord fragmentation discredited the Beijing regime, which had accepted foreign privileges.

How the challenge unfolded

• Mass action: the May Thirtieth Movement (1925) began after police fired on protesters in Shanghai. It was followed by the Canton–Hong Kong strike-boycott, which hit British trade directly.
• Military pressure: under Chiang Kai-shek, the Northern Expedition (1926) carried nationalism up the Yangtze. Britain claimed "strict impartiality towards the contending factors" [1], but one of those factions was attacking foreign privilege itself.
• Seizure on the ground: crowds overran the British concession at Hankow. Britain did not fight back. It signed an agreement in February 1927 that dissolved the British municipality and placed the area under a Chinese administration [2][3].
• Diplomatic abrogation: in July 1928 the Nationalist government declared that expired unequal treaties were "ipso facto abrogated" [4]. The US–China treaty of July 1928 conceded "complete national tariff autonomy" [5].

Popular anger (1919) → Party-army (1923–26) → Boycotts (1925)
        → Concession seizures (1927) → Treaty revision (1928)

Flowchart: how nationalism escalated against the treaty system

Limits of the challenge

• Concessions were selective: Britain gave up a peripheral concession at Hankow but sent troops to defend its main interest, Shanghai.
• Partial results: extraterritoriality lasted until 1943. The KMT–Communist split of 1927 also divided the nationalist movement.

In the 1920s, Chinese nationalism attacked the treaties through street protest, party organisation, military advance and diplomacy. Together these turned the unequal treaties from enforceable rights into terms open to negotiation. Abolition was completed only in 1943, but the decade showed that organised popular sovereignty can take apart informal empire. The idea of equality and mutual respect for sovereignty later shaped Asian anti-colonial solidarity, including India's support for China and the Panchsheel principles.