I love to compare different time frames. Poetry can evoke the time of the subject. By a very careful choice of words you can evoke an era completely throw the poem into a different time scale.
I don't think American poetry has gotten any better in the past 35 years. Oddly enough creative writing programs seem to have been good for fiction and I would not have predicted that.
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One of the most powerful devices of poetry is the use of distortions. You can go from talking about the way a minute passes to the way a century passes or a lifetime.