Why was the missouri controversy in 1820 significant? it demonstrated the wisdom of the founding fathers in adopting the three-fifths clause. it revealed a sectional divide that potentially threatened the union. it resulted from overly ambitious proslavery politicians seeking to score political points. it required a constitutional amendment, the tallmadge amendment, to be solved.

Option: It revealed a sectional divide that potentially threatened the Union.

Explanation:

Missouri controversy in 1820 helped the legislation from getting divided between the slave and free states. It also helped in balancing the powers in the south and north states by converting Maine as a free state, Missouri as a slave state. The compromise stopped the spread of slavery in the north (Louisiana territory) from the southern line of latitude 36 degrees 30'.  

not sure might be he acquired the entire oregon territory from great britain

the answer is c. hope this