1 and 1840, the opium war became a semi-colonial and semi-feudal society.

2. 19 19, the may 4th movement, and the new democratic society.

3. 1949, New China was founded and became a socialist society.

Modern China refers to 1840 to 1949.

The modern history of China began at 1840 and ended at 1949.

1840 the opium war to 19 19 the eve of the may 4th movement was the stage of the old democratic revolution. From the May 4th Movement in 19 19 to the eve of the founding of People's Republic of China (PRC) in 1949, it was the stage of the new democratic revolution.

The whole modern history of China is the history of China becoming a semi-colonial and semi-feudal society.

The modern history of China began with the outbreak of the Opium War between China and Britain in 1840 and ended with the collapse of the Nanking Kuomintang regime in 1949. It experienced the late Qing Dynasty, the provisional government of the Republic of China, the northern warlords and the national government, and it was a semi-colonial and semi-feudal society in China that gradually formed and collapsed.