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 .
I would strongly suggest indaba. It allows each country to be heard and they can come to a conclusion quickly. They can only voice their opinion in a certain way. A country gives their Red Line in a diplomatic way and the other can respond with their hard limits.
Brown v. Board of Education was a landmark case in which it was finally proven that segregation in institutions of education was highly unconstitutional, so you could say that that is the greatest effect since it made other schools become open for everyone as well.
The answer is A because many people attacked the Emancipation Proclamation because it allowed some states to continue to use slave labor. Border states such as Maryland and Delaware, which had remained loyal to the Union, were allowed to continue using slave labor, as were any states already under Union control.
