"Grass" is actually a poem that was written by Carl Sandburg. This is a poem in which he has published right after the World War I which is in the year 1918. Based on this poem, you can sense an unforgiving tone in it. Therefore, I can say that the attitude that the author expresses is "anger". Hope this answer helps.
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A relative pronoun is one which is used to refer to nouns mentioned previously, whether they are people, places, things, animals, or ideas. ... There are only a few relative pronouns in the English language. The most common are which, that, whose, whoever, whomever, who, and whom.
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