It was the National Association of the Advancement of Colored People. Also known as NAACP
"Its<span> location limited its contact with other advanced cultures" would be the best option from the list, since a system of boundaries made it inadvantageous for people to both come and go from the territory. </span>
Most of the time; less than always, but more than occasionally.
One reason is that because the slaves worked in the fields that there was natural resources to process on the northern factories
