I can't think offhand of any American poets who have Mandelstam's urgency, but it's a different country and a different time, and I don't think it would make much sense to say that this is something that's "missing" from contemporary American poetry.
Christian WimanMandelstam is the sort of poet who comes along very, very rarely. Even the two Russian poets whose work is often linked with his - Anna Akhmatova and Marina Tsvetaeva - though their work is more "urgent" than most American poetry, seem to me to operate at a lesser charge than Mandelstam.
Christian WimanWhat we call doubt is often simply dullness of mind and spirit, not the absence of faith at all, but faith latent with the lives we are not quite living, God dormant in the world to which we are not quite giving our best selves.
Christian WimanI am a Christian because of that moment on the cross when Jesus, drinking the very dregs of human bitterness, cries out, My God, my God, why hast thou forsaken me? (I know, I know: he was quoting the Psalms, and who quotes a poem when being tortured? The words arenโt the point. The point is he felt human destitution to its absolute degree; the point is that God is with us, not beyond us, in suffering.)
Christian Wiman