Answer:
A major reason for the formation of groups like the National Congress of American Indians was to show the Whites that lived East of them that they were not the "savages" that they were as depicted by the newspapers, and that they can adapt and become like the whites. On top of that, it was to give them a structural government to rely on in case the Americans wanted to deport them west. Of course, this did not work, as most, if not all, Native American tribes were deported west.
Answer: Gulags were started to make money for the Russian goverment, and concentration camps were made to exterminate people.
Gilded age, as the name implies that it is a period when the American economy’s growth is masked by urbanization and industrialisation but inherently there were problems like corruption and poverty.
There was extreme modernization due to the European immigrants who started to build factories and steel frame construction was possible at that time. People started to leave country side in search of towns and cities due to mechanization which helped for the swift progress of the economy.
The rich remained and poor lead a petty life as there was an impersonal relationship that existed between the owners and the workers and corruption was at its peak.
I’m fairly sure that B is the correct answer. Presidents can not form treaties without approval.