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If the insertion of 16,000 advisors by US president Kennedy by 1963, then the Vietnam War was the longest war in US history. Opinions differ as to when the Vietnam War actually started.Generally speaking the wars fought against Native Americans by the US are not categorized as "wars" . By example, the conflicts of the British in British Canada against Native Canadian Tribes are also not considered wars.

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8y ago
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13y ago

The Revolutionary War was the longest at about 8 years.

It is important to note that we have not actually been at war since 1945. Our Congress doesn't declare war any longer, though it is believed that they still do have the sole power to do so, according to the Constitution.

The longest military fighting would be the collective battles and massacres of the Native Americans, which started before our nation was a nation, and ended towards the end of the 19th century, which would have it at a century, at least.

The longest military fighting against a specific people in a consistent and enduring fashion was the Vietnam conflict at anywhere from 12 to 16 years depending upon how one classifies "hostilities" and "military involvement".

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11y ago

Vietnam War

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