What is the significance of Literary Conventions in Short Story and Poetry? I hope you help me.

A literary convention is a commonly used device or aspect of a certain kind of work. If you are reading a certain type of literary work, you can expect it to conform to certain conventions. For example, plays are typically divided into acts and scenes, and characters generally speak to each other with dialogue. In Shakespeare's dramas, characters communicate their inner thoughts through the use of soliloquies. If you do not understand this particular literary convention, it will be difficult for you to make sense of what is going on--you might think that the character is speaking to other characters rather than privately expressing their inner thoughts. Some literary forms, like the novel, for example, have fewer conventions.

the third paragraph is your answer,

"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. "