Which line from the poem "Monet’s ‘Waterlilies’” by Robert Hayden includes an allusion?

The allusion is in “Today as the news from Selma and Saigon.” Selma refers to the civil rights marches and violence in Alabama, while Saigon refers to the Vietnam War, bringing real historical events into the poem. The other lines describe light, space, or the world without naming specific historical references.

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