The answer is B. A person's own idea or explanation about something.
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Samoa was a stopping point for the US Merchants.
Cities that have been white became centres of black culture; this can be seen, for example through the great influence of black churches and jazz clubs.
The war was fought because America was built upon slavery. During the Industrial Age, the northern economy no longer needed slavery. The south however was wasn’t ready nor was trying as hard to give up its dependency on slavery. The south economy would plummet and life for southerners would drastically make a down spiral if they couldn’t have access to expensive but efficient workers you never had to pay for.
Answer:
Manhattan Project National Historical Park