When the Soviet Union fell, America was left without a clear "enemy #1". Who or what emerged to take its place? How did this force change in American military policy?

Assignment is a 200 word response, APA format,intext citations & referenced/non-plagiarized work please. Please use textbook for or part of your response, thanks. Textbook in use: Millet, Maslowski, & Feis, 2012). For the common defense: A military history of the United States from 1607 to 2012 (3rd ed.). New York, NY: Free Press.