From the article:

In truth, the United States of America has been engaged in some kind of war during 218 out of the nation’s total 239 years of existence. Put another way, in the entire span of US history, this country has only experienced 21 years without conflict. For a sense of perspective on this sobering statistic, consider these 4 facts about the history of US involvement in military conflict:

• Pick any year since 1776 and there is about a 91% chance that America was involved in some war during that calendar year.
• No U.S. president truly qualifies as a peacetime president.  Instead, all U.S. presidents can technically be considered “war presidents.”
• The U.S. has never gone a decade without war.
• The only time the U.S. went five years without war (1935-40) was during the isolationist period of the Great Depression.

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