Natural boundaries often don't make borders. Rivers are as much a highway as a barrier. Likewise, mountain ranges might seperate highlanders from lowlanders, in

Natural boundaries often don't make borders. Rivers are as much a highway as a barrier. Likewise, mountain ranges might seperate highlanders from lowlanders, instead of one side from the other. Also, it wasn't for want of trying. King William's War, Queen Anne's War, King George's War, the French and Indian War, the American Revolution, the War of 1812. Not to mention the Fenian Raids.