Why is Yang less crowded than Chen?

Among ordinary people in Sichuan, many people surnamed Yang claimed that their ancestors moved to Sichuan from Xiaogan Township, Macheng County. For example, the ancestors of the new capital Yang Shengan moved from Xiaogan Township, Macheng County. Many Yang families in Chongzhou and Yucheng District of Ya 'an claimed that their ancestors moved from Xiaogan Township of Macheng (Yang in Zhongli Town of Yucheng District claimed that their ancestors moved from Kuzhu Zhai in Xiaogan Township of Macheng). Although Yang, the same surname, moved from Xiaogan Township in Macheng, they are not necessarily the same clan or close relatives. Even if each has a Yangjiashu, it may not be able to unite the clan. \ r \ nThe questioner said that the time for ancestors to enter Sichuan was 1370, which was 30 years from Yuan Dynasty to Zheng Zheng, 5 years from Ming Dynasty to the Great Xia regime, and 3 years from Zhu Yuanzhang to Hongwu. Zhu Yuanzhang had not yet entered Sichuan at this time, and the Daxia regime was in charge of Sichuan. Hongwu four years ago, a large number of immigrants moved to Sichuan from Macheng County or via Macheng County, and defected to the relatively enlightened Daxia regime. It is a fact that Yang's ancestors moved to Sichuan at different times four years ago in Hongwu. For example, a man named "yangsi" in Changsha, Hunan Province, joined the Red Scarf Peasant Uprising Army at the end of the Yuan Dynasty and became a general with troops. Yang Si once led troops to a soldier village in the northern mountainous area of Macheng County, Hubei Province. This village is called "yangsi Village" (located in Chengmagang Town, Macheng City). Later, another general of the Red Scarf Army, Ming Yuzhen, went to Sichuan and Shaanxi. Yang Sishan fought in the water, often dredging rivers and building water conservancy projects, which brought benefits to the production and life of ordinary people and was deeply loved by ordinary people. After yangsi's death, yangsi Temple, Zhenjiang Wangye Temple and Lang Ping Palace were built in many places to worship him. Today, there is a place called "Yang Siying" near the old county seat of Hanyuan County. It was four years after Hongwu, when Zhu Yuanzhang summoned the old headquarters and was placed in the \ \ "military camp \" here. \ r \ nAs the place name of "Gaokanyan Houshan Old Courtyard", some names of Gaokanyan are "High-order Weir" and "High-pole Weir" ... which is the Gaoan River in the middle of qu shui River in Macheng today. "Gaoan River", like "Sophora japonica" in Shanxi, is the starting point for the concentration of immigrants. As for the "old courtyard behind the mountain", I will go to Macheng myself.