U.S. Poet Laureate Tracy K. Smith's Wade in the Water is her most recent collection and the first I've read. I think it makes an excellent introduction to her work and wouldn't be a bad place to start if you're new to contemporary poetry. She does not intimidate, nor does her language obfuscate.
The two middle sections engaged me most. The first mines the Civil War era past and makes use of erasure and historical and primary sources in a way that both gives the suffering of African Americans at the time specificity and voice while absolutely illuminating continued injustices in the present. The second also makes poetry out of found materials to focus on contemporary issues such as the environment and racist violence. However, the poems don't attack; they feel like they come from a place of hope.
A book I'm sure I'll come back to soon, after I read her other collections, of course. :)