What was the main reason many Southern states
chose to seceed from the Union?

Slavery

Explanation:

The direct cause was Abraham Lincoln, a Republican president being elected, which caused South Carolina to secede and the rest of the southern states followed. The long term reasons were of course the issue of slavery. The southern states wanted to transport their slaves anywhere in the country, and felt that their interests would be threatened if Abe Lincoln was elected.

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the correct statement is letter a.   according to the mandate of heaven, kings were considered godlike beings, so they could do as they .

the mandate of heaven is a chinese political and religious ideology used since ancient times to justify the rule of the king or emperor of china, that has been in place since the zhou until the dynasty system ended. it has been created to justify the zhou as the main power of the region. in order to keep harmony, the ruler has to make what he wants and what people want. he had to make good choices to satisfy the people and then they will be happy and keep you in power.