"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.
In the landscapes of Texas and Mexico.
I think it's explanation since the text shows comparison which isn't direct, ni similar words are present, ruling out synonyms and examples aren't present in the text.
As long as isn't really used for exceptions.
Well, maybe in things like "You can have ice cream <em>as long as </em>you eat your veggies." Then it's a little like saying "You can have ice cream <em>if </em>you eat your veggies"
But
"You can have ice cream, <em>but </em>you need to eat your veggies first."
Except
"Everyone can have ice cream, except for Gally"
Barring
I'm not really sure about this one...
Um, I hope this helps!