The name of the Chinese Dynasty that ended the period of disunion is Yang Jian.
Answer: C. Europeans began to search for a water-based trade route to Asia.
Explanation:
Before the Ottomans conquered Constantinople, the Europeans used it to access Asia via the Silk Road. With the conquest of the city, Europeans did not want to go through Muslim Ottoman held territories and so had to find a water-based route to Asia to continue trade.
This was accomplished in 1499 when Vasco da Gama reached India via the ocean and heralded a new age in sea exploration.
<span>While it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton. In fact, the opposite occurred. Cotton growing became so profitable for the planters that it greatly increased their demand for both land and slave labor.</span>
For 10 I would say B
and 11 I would say B as well
So people wouldn't think it was poisoned