Congress had decided that once a slave traveled into a free state, they were free and they could never be enslaved again. But in the Dred Scott decision, they changed their mind and people no longer had to honor "once free, always free."
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The views of Native Americans and Europeans differed in terms of property ownership because under English law, discoveries were made in the name of the sovereign and all lands belonged to the monarch, to be disposed of at the will of the crown. Joint stock companies received charters from the crown and parceled out land.
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.
12) C 14) b. 15) A hope it helps
