Answer:
The Kansas-Nebraska Act was an 1854 bill that mandated “popular sovereignty”–allowing settlers of a territory to decide whether slavery would be allowed within a new state’s borders. Proposed by Stephen A. Douglas–Abraham Lincoln’s opponent in the influential Lincoln-Douglas debates–the bill overturned the Missouri Compromise’s use of latitude as the boundary between slave and free territory. The conflicts that arose between pro-slavery and anti-slavery settlers in the aftermath of the act’s passage led to the period of violence known as Bleeding Kansas, and helped paved the way for the American Civil War (1861-65).
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You could say that he appealed to pathos. It's an appeal to emotion while ethos is to credibility. He used pathos to speak about sad things like secession and about the evils of slavery and why it should end. He didn't have to appeal to credibility because he was already the president so everyone knew why he was competent.
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Answer:
Manifest Destiny was an expansionist political stance carried out in the United States during the 1800s, through which the nation's expansion from the Atlantic Ocean to the Pacific was urged. Thus, it was sought that the United States became a bioceanic nation, controlling trade on both sides of the continent.
Therefore, Manifest Destiny could have equally been fulfilled without annexing Texas, since this state does not border either ocean but the Gulf of Mexico.
I believe the Berlin Airlift was necessary because Berlin was located in East Germany (a Soviet satellite) and at this time (the cold war) there were geopolitical tensions between the Soviet Union and the United states. so because of this the only viable option to supply west Berlin was to do an Airlift.