Between the time of the Scottish uprising under Bonnie Prince Charlie, until into the Dickensian period, the countryside was being depopulated and increasingly drafted into the industrial machine of the empire. Scottish farmers were forced off the land so the lords could run sheep farms that supplied the mills. Those forced off the land were drafted to work in coal and iron mines and steel and woolen mills. Those that refused got transported to the Hebrides, and to Nova Scotia, etc. Thats how my own Clan Gordon ancestors came to Nova Scotia, through the mills of Liverpool.