The correct answer should be that he shared "Common Sense" to all Americans.
I think the answer is "In 1867, the United States bought Alaska from Russia for $7 million". When you ask the question "when" the question is asking about time. In this excerpt, when is answered by "in 1987". while the sentence supported it is the event that happened during that time, which is " The US bought Alaska from Russia for $7 million.
I think it helps to create the rhythm of the stanza, is this a multiple choice?because i could help you a lot more if it was haha i'm sorry.<span />