There are many aspects to Romanticism, although from the list above perhaps the best options are "emotion" "mystery" and "melancholy"
Slavery was THE great debate of the 1850's as was the question of continuing a union that threatened the lives and property of the South. It caused Lincoln's election in 1860 and fueled the movement to secession and war. Slavery was the dividing point over which there was a limit to the compromises that could be effected. It clearly drove the decade as it had shaped the whole century.
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A daimyo was a feudal lord in shogunal Japan from the 12th century to the 19th century. The daimyos were large landowners and vassals of the shogun. Each daimyo hired an army of samurai warriors to protect his family's lives and property.