When it comes to war, the American public is remarkably fickle.
The responses of Americans to the Iraq and Afghanistan wars provide telling examples. In 2003, according to opinion polls, 72 percent of Americans thought going to war in Iraq was the right decision. By early 2013, support for that decision had declined to 41 percent. Similarly, in October 2001, when U.S. military action began in Afghanistan, it was backed by 90 percent of the American public. By December 2013, public approval of the Afghanistan war had dropped to only 17 percent.
In fact, this collapse of public support for once-popular wars is a long-term phenomenon. Although World War I preceded public opinion polling, observers reported considerable enthusiasm for U.S. entry into that conflict in April 1917. But, after the war, the enthusiasm melted away. In 1937, when pollsters asked Americans whether the United States should participate in another war like the World War, 95 percent of the respondents said “No.”