Question

What is the analogy in "O Captain My Captain"?

I tried looking it up but the answers were not making sense... So if anyone could clarify it for me that would be great! :)
Ms. Sue
"Our fearful trip is done." = Civil War

"Where on the deck my Captain lies,
Fallen cold and dead." = Lincoln's assassination
M
Thank you so much!
Ms. Sue
You are very welcome.