Tyrant: The power is concentrated in the hands of one person. Examples: Hitler's Germany, Stalin's Soviet Union, the word comes from the Greeks though, so ancient Greece is a good example as well. The Tyrant is the word for the ruler, not the country suffering it.
Oligarchy: The power is concentrated in the hands of a small group. It is like instead of having one tyrant, you have a handful of them. This is also considered to be a dark state of a country. Comes from ancient Greeks as well, they had times when the country was an oligarchy.
To gain its iron ore and coal doposits
Books hes was verry susessful with that my favorite book from him is great expectations
Jose lopez portillo y pacheco
It prevented the settlers from moving West of the Appalachian Mountains, hope this helps!!