Treaty of Mutual Cooperation and Security between the United States and Japan
Many democracies have voluntary military ties with United States. See NATO, ANZUS, Treaty of Mutual Cooperation and Security between the United States and Japan, Mutual Defense Treaty with South Korea, and Major non-NATO ally. Those nations with military alliances with the U.S. can spend less on the military since they can count on U.S. protection. This may give a false impression that the U.S. is less peaceful than those nations.