Answer:
Franklin D. Roosevelt was the 32nd President of the United States of America during the term that took place between 1933 to 1945. His administration addressed the crisis caused by the dust bowl on the Great Plains by making sure New Deal agencies were placed there and focused on working to restore the soil and establish sound farming practices in the areas that were devestated.
They got to Oklahoma by land on their horses and wagons.
'Vassals were the lowest class in the newly established government system's hierarchy.
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What is hierarchy?</h3>
A hierarchy is an arrangement of items (objects, names, values, categories, and so on). Hierarchy is a key concept in many disciplines, including architecture, philosophy, design, mathematics, computer science, organizational theory, systems theory, systematic biology, and social sciences.
A hierarchy can connect entities directly or indirectly, and it can connect entities vertically or diagonally. In a hierarchical system, the only direct links are to one's immediate superior or to one of one's subordinates, though a largely hierarchical system can also incorporate alternative hierarchies. Hierarchical links can extend "vertically" upwards or downwards by following a path with multiple links in the same direction.
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You mean what possible advantage could Oligarchy have?
Oligarchy could mean that people in power will have good education and for example won't be manipulated by populists. For example often people choose their representatives based on very little information, and in an oligarchy, where a small portion of a society (the riches and best educated) rules, it could be more likely that the rulers will have the necessary education and preparaation.