A person has a whole range of characteristics that we assume all members of that group have.
An appalling of black codes and other racist laws/acts as well as adding the 14th amendment which gave African Americans a vote.
Hope this helps
Samuel Slater invented the cotton gin which cleaned the cotton faster.
Rene Decartes was a French philosopher born in 1596 a time when many long held benefits where changing. His new way of thinking led him to decide to doubt everything until he could prove it. His goal was to achieve certainity through methodical and logical questioning.