<span>The main difference
between “The Purple Cow” and Frost’s poem "Mending Wall" is the use
of rhyming in “The Purple Cow”. The former uses rhyming in alternative lines,
while the latter does not use any form of rhyming at all. </span>
It was successful because it allowed the protection of the United States against anyone who threaten or possessed weapons that could be used against the US.
