Why were the discoveries of astronomer like galileo seen as radical and a threat to the church authority? what was the new idea that they proposed?

They were seen as a threat because they went against the teachings of the Church. The new idea was that the Earth revolved around the sun instead of the sun and the whole universe revolving around the Earth

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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