The reasons for American isolation at the beginning of the twentieth century are quite different from those reasons in our contemporary moment. After World War I, Americans were deeply disillusioned by the horrific nature of the war ranging from the use of chemical gas, aerial bombardment, tank warfare, and trench warfare. Contemporary concerns about US involvement in the world are based on the Vietnam experience. Most Americans felt the aims of the war were poorly defined and its escalation was largely concealed from the American public. Since Vietnam, Americans have been leery of any protracted U.S. military engagement that is not properly defined in terms of aims and duration. The best example of this concern was the US invasion of Iraq during the second term of George W. Bush.
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