2. China's modernization exploration: Westernization Movement, Hundred Days Reform, Revolution of 1911, New Culture Movement.
3. The birth and development of new democracy: May 4th Movement, the first congress of the Communist Party of China (CPC), the first cooperation between Kuomintang and Communist Party, Nanchang Uprising, Autumn Harvest Uprising, Jinggangshan Revolutionary Base, Long March, Zunyi Conference, Chongqing Negotiation, War of Resistance against Japanese Aggression, Liberation War and founding ceremony.
This is probably the case, in which the content and significance are the most important, and the year is not very important.
I just graduated from grade three. I hope it works for you.