The correct answer is: "He developed mathematical principles"
René Descartes (1596 – 1650) was a French philosopher, mathematician, and scientist who lived more than 20 years in the Dutch Republic and was one of the main figures of the Dutch Golden Age.
His great influence in mathematics has been his major contribution to the Scientific Revolution, although his work in philosophy is outstanding too. He developed the the Cartesian system of coordinates. He is considered the father of analytical geometry, which connects both algebra and geometry and which has been used in the development of infinitesimal analysis and calculus .
D - None of the Above
East and West Germany were reunited in October of 1990 and the other countries Poland and the Czech Republic are separate as are England and Scotland.
It helped them farm and to grow crops. They needed this to live and to trade. It had a good source of water and could be used to drive enemies away from them.
They were treated with slavery but gave water and bread
The correct answer is number 2) Cold War confrontations.
Unfortunately, you forgot to attach the map. Where is the map?
Without the map, just you know the information. We don't.
However, trying to help you we did some deep research and found one map that highlights places where the United States and the Soviet Union had conflicts and confrontations during the Cold War years.
The places highlighted on the map are the Island of Cuba, North and South Korea, and North and South Vietnam.
So the correct answer indeed is:
A historian could best use this map to study the topic "Cold War confrontations."
During the tense years of the Cold War, the Soviet Union and the United States competed in the arms race, the space race, and the spread/containment of Communism in different places of the world such as the Island of Cuba Korea Vietnam.
