The Convention of 1818 set the boundary between the United States and Canada at the 49th parallel. It also secured fishing rights for the United States off the coast on Nova Scotia and established joint control of the Oregon Country for ten years. What was the significance of the Convention of 1818? A. The convention settled U. S. and British disputes regarding borders, including areas of Nova Scotia and Canada. B. The convention established Great Britain as the sole European power allowed to trade with the United States. C. The convention gave the British the option of settling large areas of U. S. territory, including the Oregon Country. D. The convention marked the beginning of diplomatic cooperation between the United States and Great Britain.