History is complicated and can only be recited. The only skill is to sort out each historical period according to politics, economy, culture, nationality and diplomacy when all the knowledge points are clear, which will have a miraculous effect. Recite in a row. For example, in terms of economy, the earliest knife coins and jiaozi can be linked with later Shanxi merchants and Huizhou merchants. If we sum up these points frequently, we can divide them into many according to economy and politics. Each one can be strung together at the end.
Some of our classmates made up their own jingles to commemorate them. For example, China's early slave society period: Xia, Shang, Western Zhou to Eastern Zhou, and slave society to Spring and Autumn.