As a Canadian living in the US, I'm curious to know who Americans study. The fact is, I've mentioned several Canadian poets to Americans - Eli Mandel, Irving Layton, and others and no Americans seem to know who they are. Who do you study? Who are you interested in? I've always loved poetry and even published a few.
When American poets are mentioned, a few standouts immediately spring to mind: Theodore
Roethke, Edna St Vincent Millay, Edgar Allan Poe, Sylvia Plath, Emma Lazarus, Walt Whitman, Maya Angelou, Edith Wharton, William Carlos Williams, Carl Sandburg, Emily Dickinson -- it depends which era you are referencing, but there are many American poets to choose from.
The Museum of American Poetics might be a good place to start if you are interested in American poets. Also the Academy of American Poets at poets.org.
Best wishes in your poetry writing endeavors!