The Missouri Compromise was an exertion by Congress to defuse the sectional and political competitions activated by the demand of Missouri late in 1819 for affirmation as a state in which subjection would be allowed. At the time, the United States contained twenty-two states, uniformly partitioned amongst slave and free.
Others felt that it made the north appear to be more forceful in its abolitionist servitude perspectives and added to southern hatred, which may have prompted the Civil War happening sooner. The Missouri Compromise was intended to make a harmony amongst slave and non-slave states.
I think you mean decentralization. It's the transfer of authority from the main government to local governments.
Not sure what you mean by the question but France did indeed enter the war when Germany declared war on Russia.
Answer:
D. Southerners cited tariffs protecting domestic industries as a major grievance against the United States government
Explanation:
The factor that most supports the idea that regional economic differences were a major cause of the civil war is "Southerners cited tariffs protecting domestic industries as a major grievance against the United States government."
The above statement shows that southerners were complaining about tariffs is favoring the northern region because it protects domestic industries. The northern region of the United States has an economy based on industries in which tariff is protecting for them, however, the Southerners don't like that situation.