During the Civil War, "Copperheads" referred to B. NORTHERN SUPPORTERS OF THE CONFEDERACY.
The Copperheads were those vocal democrats located in the Northern United States of the Union who were opposed to the American Civil War. They wanted to have an immediate peace settlement with the confederates.
The Republicans were the ones who called these antiwar democrats "copperheads"; likening them to the venomous snake.
The North Vietnamese<span> government and the Viet Cong were fighting to reunify </span>Vietnam<span>. They viewed the conflict as a colonial </span>war<span> and a continuation of the First Indochina </span>War<span> against forces from France and later on the U.S. ... Beginning in 1950, American military advisors arrived in what was then French Indochina.</span>
To have more food available to feed the troops
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I think you may need to finish the rest of this question, or rephrase it, I'm happy to help either way.