Descartes' thinking was a radical shift from Medieval thinking because he emphasized reason and scientific knowledge instead of religious tradition.
Rene Descartes was a prominent French philosopher, the founder of modern philosophy. He was a rationalist who systematically sought to doubt everything possible. His goal was to find a solid foundation for certain information. Descartes was heavily influenced by advances in physics and astronomy and one of the central figures of the scientific revolution. He first gave an idea of what natural science would offer in the future.
His rationalist theories, his vocation to find logical explanations for all events and his constant criticism of traditions systematically confronted philosophies based on medieval beliefs and Aristotelian philosophers, because they had deep roots in religious beliefs and the cultural traditions of Ancient Greece.
Many of the American Indians who fought in the French and Indian War wre eventually pushed off their land (and of course many were killed as well), since the British won the war.
Roe v Wade was a controversial case and still is today because it deals with abortion. People have very strong opinions both ways about it and whether or not a woman should be able to have one for whatever reason.