What major historical event does the movie "Entering * * * and" refer to?

The bourgeois old-democratic revolution is the embodiment of China's old-democratic process of saving the country.

The plot background is the history of China in the twenty years from Empress Dowager Cixi in the Qing Dynasty to Yuan Shikai's failure in claiming the throne in the early years of the Republic of China, including the Westernization Movement, the Sino-Japanese War, the Reform Movement of 1898, the Boxer Movement, the New Deal after the Boxer Movement, the Revolution of 1911, the Second Revolution, zhang xun restoration and other historical events.

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