The separation of the Paleolithic and Neolithic Ages mark a great divide in the lives and cultures of prehistoric peoples. Many aspects of everyday life were modified to suit a new standard of living. Society, Economy, and Technology were greatly affected by the "Agricultural Revolution" that spawned the Neolithic Age.
Because it didn’t receive support from the senate. Also the U.S wanted to keep America out of European affairs.
D. Spices and Silk
That is most likely the correct answer