It has primarily been the socialists and the communists who have believed that workers would overthrow wealthy business owners, since they feel that the current economic system of capitalism is flawed.
A slave is a person that belongs to another one and is treated as property. Serfs, I'm not so sure about this now, were renting the land out from the landowners.
The picture with the Native American children standing in front of a school shows a major change in the policy toward the Native Americans. Initially, the Native Americans were discriminated against on pretty much all levels. They were seen as wild and uncivilized, so the white settlers were usually forcefully loving them to live into regions far away from them and not allowing them to integrate with them.
This started to change gradually though as the policies were changing against discrimination of the people, and when the stability of the country and its development came to be the most important things. The government of the United States that it would be for the best interest of the country and the Native American population if the Native American children got involved into the education system. By being educated, the children would be able to integrate into the American society, as well as develop skills so that they can compete on the labor market and be able to contribute to the American economy, as well as prosper on individual level.
This process was gradual, but it was effective, and it managed to successfully integrate the Native American population with the other people.
Justinian’s codes provided legal reforms for a collapsing byzantine empire. When Justinian conquered Italy, his reforms spread through the European continent.
