Modern Chinese history refers to the history of China since the late 19th century, covering political, economic, cultural, social and other aspects of change and development. During this period, China experienced many major social and political changes, which had a profound impact on China's future development. A brief summary of modern Chinese history is as follows: - In 1840, the Opium War broke out and China was forced to enter the process of modern times. - At the end of the 19th century and the beginning of the 20th century, China began to carry out the Westernization Movement and the 1898 reform in an attempt to reform the feudal system and improve the country's strength. - At the beginning of the 20th century, China began to carry out the New Culture Movement. It advocated democracy, science, and anti-feudalism, which promoted the progress of Chinese society. - In 1911, the Xinhai Revolution overthrew the Qing Dynasty and established the Republic of China. - In 1927, the Guomindang launched the Northern Expedition, overthrowing the rule of Wu Peifu, Sun Chuanfang and other warlords and establishing the National Revolutionary Regime. - In 1937, the Anti-Japanese War broke out, and China began an eight-year war against Japan. - In 1949, the People's Republic of China was founded, and China entered the period of socialistic construction. - In 1978, the implementation of the reform and opening up policy began the process of transition to a market economy. The development of modern Chinese history had experienced many ups and downs, but it had also laid the foundation for China's future development. Today, China has become the world's second largest economy and plays an important role in international affairs.