How did the Free Soil party reflect the growing sectional differences of the North
and South?

The Free Soil party membership was largely southern and demanded that the North accept all recently freed slaves and gave them land. The Free Soil party highlighted the growing religious differences in the North and South resulting from Catholic missionaries.

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it was certainly a debatable decision, mainly because it was based primarily on political - and not on legal or social - views. since the congress at that time was led by members of the republican party, and the territory that the tribes wanted to turn into an exclusively indian state was predominantly democratic, the proposal (as expressed in the constitution) did not succeed, but the constitution itself proved to be of crucial importance in the creation of the state of oklahoma, and, most importantly, it guaranteed the involvement of representatives of the indian tribes in the government of the future joint state.  

as a member of congress, i would have voted to ratify the constitution, or at least to have it tabled. ignoring it was an interested and partial decision.