Answer:the Southern states' desire to preserve the institution of slavery.
Explanation:
When North Vietnam acted against South Vietnam and sent troops into it in the early 1960s, Congress authorized the president to escalate the conflict.
<h3>What happened after North Vietnam attacked a U.S. Warship?</h3>
The Gulf of Tonkin incident saw the North Vietnamese navy attack a U.S. warship.
This led to the Johnson administration asking the U.S. Congress for permission to escalate the conflict which was granted to them.
Find out more on the Gulf of Tonkin incident at brainly.com/question/15593184.
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Answer:
Yuan dynasty was marked by struggle, famine, and bitterness among the populace.
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