The answer would be immagrants started coming in to the US
A map noting important locations
The tradition of building a ziggurat was started by the Sumerians, but other civilizations of Mesopotamia such as the Akkadians, the Babylonians, and the Assyrians also built ziggurats.
The knights and the samurai shared lot of similarities in their social status and their purpose in the societies. Both of the were protectors of the leader of the country. For their services of protection they were given free pieces of large parcels of land. They were the best warriors in their respective societies, and when there was a battle they were the elite unit that usually was the one that was winning the battle/war. Their only job in the society was to train for battle, and fight in battle.
According to Karl Marx, the economic ideas behind socialism would lead to a revolution because when the working class of people would revolt against the upper class which is known as the burgeoise, that would be the only way of achieving true socialism.