Hemingway uses
to develop the character of the narrator in this passage.

Indirect characterization

Explanation:

I could not find the passage that is missing but since Hemingway was often using Indirect characterization for his character and narrator I will try to explain to you what is that and how can you recognize it in your passage.

He is best known for his dialogue in his artwork that is considering very realistic characters and situations. He wanted his readers to imagine how they are acting and looking by using this type of characterization. Their characteristics are shown in their dialogue but indirectly so readers can imagine and see what they were like.

to inform readers about the ways young people improve the world.

the president was the speaker and it was a great part of history.

explanation:

video of the national aeronautic space administration's (nasa) coverage of president john f. kennedy’s address at rice university, houston, texas, concerning the nation's efforts in space exploration. in his speech the president discusses the necessity for the united states to become an international leader in space exploration and famously states, "we choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."