The Kansas Nebraska act upset many northern because

It would bring slavery into the north and cause a huge battleground.

Explanation:

It would open the North to slavery. Northerners were outraged. In an era that would come to be known as "Bleeding Kansas," the territory would become a battleground over the slavery question. The reaction from the North was immediate.

it was important in history as the site of the ancient city of yin

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the answer is b just took the test