It would be the development in agricultural knowledge/technology
Development in agriculture enable hunter/gatherer society to shift their behavior. Before this, they had to keep moving from one place to another in order to seek food to live.
After the development in agricultural knowledge/technology, the society now can stay in one exact place for a long period of time and relied on agricultural product as their main source food.
After living in one same place for a long time, the needs to build things to accommodate their living start to arise. They start to built several things and repeat the process every year. In the end, large cities were developed from the initially small hunter/gatherer society.
It wasn't so much the Civil War, but the expansion of the United States that led to the Civil War, that brought about the Second Industrial Revolution, since this expansion brought a need for massive amounts of railroad materials.
For me, it is the Helsinki Accords were Ford's most noteworthy remote approach achievement and the Camp David Accords were Carter's. The Helsinki Final Act was an understanding marked by 35 countries that finished up the Conference on Security and Cooperation in Europe, held in Helsinki, Finland.
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Explanation:
Merchants on the silk road transported goods and traded at bazaars or caravanserai along the way. They traded goods such as silk, spices, tea, ivory, cotton, wool, precious metals, and ideas. Use these resources to explore this ancient trade route with your students this means without merchants they wouldn't be able to make any money. So the king relies on the merchant and the merchant controls how much money they make.
Europe maintained unity after the Roman Empire. 1 through The power of the Papacy and the Christian faith, and 2 Through Feudalism because even though it caused fractures in regions it offered a clear power structure that allowed Strong nations to bring their weaker neighbors under their direct control.