I think the answer is france, but only 70% sure.
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 .
The <u>Cold</u> <u>War</u> was the state of political hostility between countries without an outright declaration of war. The hot war ended, and the cold war started. The United States and the Soviet Union fought together against Germany. Since the end of the war, they became hostile to one another. Each worried about the strength of the other one.
