Isolationism has been a policy of many countries throughout history, including the United States. The United States pursued a policy of isolationism from the late 18th century until the early 20th century. During this period, the United States focused on its domestic affairs and avoided military alliances with other countries. The United States also avoided involvement in international conflicts, such as the First World War.
The United States abandoned its policy of isolationism after the First World War. The United States joined the League of Nations, an international organization that was designed to promote peace and cooperation between nations. The United States also began to participate in international military alliances, such as the North Atlantic Treaty Organization (NATO).
The United States has continued to pursue a policy of isolationism at times, such as during the Cold War. During the Cold War, the United States avoided direct military conflict with the Soviet Union, but it did provide military and economic support to its allies.
In recent years, the United States has become increasingly involved in the affairs of other countries. The United States has intervened militarily in countries such as Iraq and Afghanistan, and it has provided military and economic support to countries such as Israel and Egypt.
Whether or not isolationism is a good policy is a matter of debate. Some people argue that isolationism is necessary to protect a country's interests and security. Others argue that isolationism is harmful because it prevents countries from cooperating to address global problems.