Ivan's study group is preparing for a history test on world war ii. his great-grandfather was a journalist during the war, so he shares some of his great-grandfather's war stories with the group. how does this most benefit others in the group?

I believe the answer is: by offering a new perspective and more information

New perspective and information would generally ignite an opinion or an argument from members of the study group.
This would make them to explore various ideas within that topic and together they would deepen their overall context on that topic.

Was giving by lincoln on march 4, 1865-as lincoln prepared to speak, the civil war was drawing to a close-lincolns address of 703 words was the second shortest inaugural address-lincoln mentions god 14 times-505 of the words were one syllable -he used the word "war" or it's pronoun 9 times