Currently studying this right now and I am fairly confident it is A.
Answer:
The Mongol invasions of Vietnam or Mongol–Vietnamese wars and Mongol–Cham war were military campaigns launched by the Mongol Empire, and later the Yuan dynasty, against the kingdom of Đại Việt (modern-day northern Vietnam) ruled by the Trần dynasty and the kingdom of Champa (modern-day central Vietnam) in 1258, 1282–1284, 1285, and 1287–88. The campaigns are treated by a number of scholars as a success due to the establishment of tributary relations with Đại Việt despite the Mongols suffering major military defeats.[11][12][13] In contrast, Vietnamese historiography regards the war as a major victory against the foreign invaders who they called "the Mongol yokes."[14][11]
Answer:
C. It discouraged the British from supporting the Confederacy
Explanation:
The British abolished slavery years before the US, so it would look very wrong for the UK to support the confederacy, who were the ones who preserved slavery. This also wouldn't set well with the public which would erupt some protests across the nation, and the US also could've invaded Canada and that also would've been bad for the British because wars were expensive.
Television since that was the new technology that was entering everyone's houses at the time.
