What is one theme found in Walt Whitman's "I Hear America Singing"? I Hear America Singing

by Walt Whitman

I hear America singing, the varied carols I hear,
Those of mechanics, each one singing his as it should be blithe
and strong,
The carpenter singing his as he measures his plank or beam,
The mason singing his as he makes ready for work, or leaves off
work,
The boatman singing what belongs to him in his boat, the
deckhand singing on the steamboat deck,
The shoemaker singing as he sits on his bench, the hatter singing
as he stands,
The wood-cutter's song, the ploughboy's on his way in the
morning, or at noon intermission or at sundown,
The delicious singing of the mother, or of the young wife at
work, or of the girl sewing or washing,
Each singing what belongs to him or her and to none else,
The day what belongs to the day—at night the party of young
fellows, robust, friendly,
Singing with open mouths their strong melodious songs.

A.
Work and entertainment should not be mixed.
B.
Diverse people contribute to the country's identity.
C.
People are more productive when they enjoy their work.
D.
Working in a modern society allows people to have diverse skills

In which part of this excerpt from the gettysburg address does president abraham lincoln argue that the outcome of the war will depend on the determination and loyalty of northern citizens? four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal. now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. we are met on a great battle-field of that war. we have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. it is altogether fitting and proper that we should do this. but, in a larger sense, we can not dedicate—we can not consecrate—we can not hallow— this ground. the brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. the world will little note, nor long remember what we say here, but it can never forget what they did here. it is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. it is rather for us to be here dedicated to the great task remaining before us— that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain—that this nation, under god, shall have a new birth of freedom—and that government of the people, by the people, for the people, shall not perish from the earth.