The Shang dynasty (Chinese: 商朝; pinyin: Shāng cháo) or Yin dynasty (Chinese: 殷代; pinyin: Yīn dài), according to traditional historiography, ruled in the Yellow River valley<span>in the second millennium BC, succeeding the Xia dynasty and followed by the Zhou dynasty.</span>
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More food= more people, more people means you need more food, which means you get people to make more food, which attracts more people, etc, etc.
Manifest Destiny was largely led and carried out by white americans seeking the westward expansion to increase the boundaries of the United States. African Americans were impact largely because as westward expansion continued new states were brought into the union with legalized slavery in places like Texas. This had an overall negative impact on African Americans by increasing the demand for slavery and expanding the institution of slavery westward. For the Native Americans Manifest Destiny was a major catastrophe leading to the ethnic cleansing and removal of Native Americans from their homes and lands. This removal often occurred with force with high rates of violence.
The Agrarian Era is one of the most important points in the human history and development. In this era, the humans changed their lifestyle from nomadic to settled one because they were able to produce surplus of food. This resulted in great and rapid development and progress of the human societies. As the humans had much more spare time, they started to occupy themselves with lot of other things, such as science, arts, building, resulting in an explosion of inventions and advancements in a very short period of time, and the process was constantly accelerating and the human kind was moving forward quicker and quicker.