Siege of Tsingtao in the context of "Jiaozhou Bay"

Qingdao, archaicly known as Tsingtao, is a prefecture-level city in the eastern Shandong Province of China. Located on China's Yellow Sea coast, Qingdao was long an important fortress. In 1897, the city was ceded to Germany. For the Germans, Qingdao was a strategic trade center, port and base for its East Asia Squadron, allowing the German navy to project dominance in the Pacific. In 1914, following the outbreak of World War I, Japan occupied the city and the surrounding province during the Siege of Tsingtao. In 1915, China agreed to recognize Japan's special position in the territory through what became known as the Twenty-One Demands. In 1918, the Chinese government, under the control of the warlord Duan Qirui, secretly agreed to Japanese terms in exchange for a loan. Following the First World War, during the Paris Peace Conference, Japan secured agreements with the Allied powers to recognize its claim to the areas in Shandong, which included Qingdao, previously occupied by Germany. In 1922, Shandong reverted to Chinese control following the United States' mediation during the Washington Naval Conference. Today, Qingdao is a major nodal city of the Belt and Road Initiative (BRI) that connects Continental and East Asia with Europe. It has the highest GDP of any city in the province.

Administered at the sub-provincial level, Qingdao has jurisdiction over seven districts and three county-level cities (Jiaozhou, Pingdu, Laixi). As of the 2020 census, Qingdao built-up (or metro) area made of the seven urban districts (Shinan, Shibei, Huangdao, Laoshan, Licang, Chengyang and Jimo) was home to 7,172,451 inhabitants, making it the 15th largest city in China by population. Lying across the Shandong Peninsula and looking out to the Yellow Sea, it borders the prefecture-level cities of Yantai to the northeast, Weifang to the west and Rizhao to the southwest.

The May Fourth Movement was a Chinese cultural and anti-imperialist political movement which grew out of student protests in Beijing on May 4, 1919. Students gathered in front of Tiananmen to protest the Chinese government's weak response to the Treaty of Versailles decision to allow the Empire of Japan to retain territories in Shandong that had been surrendered by the German Empire after the Siege of Tsingtao in 1914. The demonstrations sparked nationwide protests and spurred an upsurge in Chinese nationalism, a shift towards political mobilization, away from cultural activities, and a move towards a populist base, away from traditional intellectual and political elites.

The May Fourth demonstrations marked a turning point in a broader anti-traditional New Culture Movement (1915–1921) that sought to replace traditional Confucian values and was itself a continuation of late Qing reforms. Even after 1919, these educated "new youths" still defined their role with a traditional model in which the educated elite took responsibility for both cultural and political affairs. They opposed traditional culture but looked abroad for cosmopolitan inspiration in the name of nationalism and were an overwhelmingly urban movement that espoused populism in an overwhelmingly rural country. Many political and social leaders of the next five decades emerged at this time, including those of the Chinese Communist Party (CCP).