Boston, New York ... Charles Town<span> [Charleston]—and none had more than 40,000 people </span>in 1775<span>.</span>
The last two are correct.
Exodusters was a name given to African Americans<span> who migrated from states along the Mississippi River to Kansas in the </span>late-nineteenth<span> century, as part of the Exoduster Movement or Exodus of 1879. It was the first general migration of blacks following the Civil War.</span>