(1) From separatist regime to unification. During the Spring and Autumn Period, the Zhou royal family declined, big countries merged with small countries, and the number of vassal States gradually decreased. During the Warring States period, only the seven major vassal states, namely Qi, Chu, Qin, Yan, Zhao, Wei and Han, were left, and wars among them continued, which made the people suffer more serious disasters. The people hated war and longed for reunification. After Shang Yang's political reform, Qin became the most powerful country among the Seven Heroes in the Warring States Period. After a large-scale merger war, Ying Zheng, king of Qin, unified the whole country in 22 1 year BC.

(2) From the disintegration of slavery to the establishment of feudalism. During the Spring and Autumn Period, due to the use of ironware and Niu Geng, private land increased, and the State of Lu first implemented the method of collecting taxes by fields, recognizing private ownership of land. The gradual disintegration of the well field system marked the gradual disintegration of the slave society. During the Warring States period, driven by the emerging landlord class, the vassal state abolished slavery after more than 100 years of political reform, and a new feudal system was finally established in the vassal state.

This topic mainly examines students' ability to accurately recognize and reproduce historical facts, to refine opinions and to describe historical facts based on key points, and to combine history with theory to answer questions. When answering this question, we should pay attention to the examination of the questions and clearly define the word "Spring and Autumn Period and Warring States Period", with the central word "trend", that is, the direction of historical development. The topic requires the use of historical facts, which requires the combination of history and theory. From this, we can sum up the historical phenomena in the Spring and Autumn Period and the Warring States Period and sort out their characteristics, then the obvious trend will naturally emerge.