The Theme of Crisis in William Butler Yeats Poems

Write an essay (1,500 words) on the following topic: Investigate the theme of Crisis in the poetry of William Butler Yeats. Discuss with reference to a selection of his poems. Create an original argument and back up your argument with quotes from his poems. you can use secondary sources to further back up your argument as well. Most poems can be found in the book "the collected poems of w.b. yeats".