Answer:
because it had Abe Lincoln in it who was the 16th president in it
Step-by-step explanation:
O Captain, My Captain: Whitman's Lincoln is a revealing portrait of President Abraham Lincoln as seen through the eyes of Walt Whitman, America's firebrand poet. Whitman's admiration for the 16th President was immediate and intense. He saw in the frontier lawyer the promise of the real American dream, a country where common men can rise to the highest heights of politics, industry, and culture.