The Great Migration, sometimes known as the Great Northward Migration or the Black Migration, was the movement of 6 million African Americans out of the rural Southern United States to the urban Northeast, Midwest, and West that occurred between 1916 and 1970.
Connecticut was not part of the Middle Colonies.
Members of the same country (the Confederacy wasn't recognized - it doesn't count as a separate country) were making absolute war on one another. It was brother fighting brother.
179,000 African American men served in the civil war