On what grounds did dred scott sue for freedom?
the inherent inhumanity of slavery
the cruelty of his master
the fact that he had lived in free states
the fact that his family would be torn apart

He sued on the grounds that he had once lived in a free territory.

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explanation:

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the california missions began in the late 18th century as an effort to convert native americans to catholicism and expand european territory. there were 21 missions in all, lasting from 1769 until about 1833.   the missions were built by the spanish starting in 1769 in order to “colonize” the territory of alta california. so the missions were important because they were the means of settling california. it also wanted to keep other european countries out of alta california. building settlements along the coast would them meet these goals. missionaries wanted to convert the indians to the roman catholic faith. california indians did much of the work to build missions.