What two nation turned to policies of isolation?

During the interwar period, both the United States and Japan adopted policies of isolation. The U.S. focused on avoiding foreign entanglements and conflicts, particularly after World War I, leading to a series of neutrality acts. Meanwhile, Japan sought to isolate itself from Western influences while expanding its empire in Asia, ultimately pursuing a militaristic and expansionist agenda. These isolationist tendencies shaped their respective foreign policies and national identities during the early 20th century.