Distinctly American poetry is usually written in the context of one's geographic landscape sometimes out of one's cultural myths and often with reference to gender and race or ethnic origins.
PC stuff just lowers the general acceptance of good work and replaces it with bogus poetry that celebrates values that in themselves are probably quite worthy.
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From reading a previous answer you know that I consider all those aspects to be part of American cultural myth and thus they figure into good American poetry whether the poet is aware of what he is doing or not.