Hong Kong was gained during the Opium wars.
The Fourteenth Amendment to the United States Constitution was adopted on July 9, 1868. Which grant citizenship to African Americans.
The items in the question relate to Compromise of 1850
<h3>What is Compromise of 1850?</h3>
After the Mexican-American War, the five acts that made up the Compromise of 1850 attempted to resolve differences on slavery in newly gained territory (1846-48). It created a new border between Texas and New Mexico, acknowledged California as a free state, gave Utah and New Mexico the option of becoming slave or free states, and made it easier for slaveowners to reclaim slaves under the 1850 Fugitive Slave Act. The Compromise of 1850 was drafted by Senators Stephan Douglas of the Democratic Party and Henry Clay of the Whig Party. Persistent dissatisfaction with its provisions played a role in the outbreak of the Civil War.
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Answer:
It was a preferable alternative to a full-scale invasion.
Explanation:
America had two choices: Use the Atom bomb or invade mainland Japan.
Truman decided to use the bomb.
A mainland invasion would have cost the lives of many more innocent people.